Acids, Bases, and Salts: The Ultimate Guide for IGCSE & O Level Chemistry Mastery
Your complete resource for IGCSE Chemistry 0620, O Level Chemistry 5070, AQA, and Edexcel syllabuses. Packed with definitions, reactions, notes, and exam secrets.
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Part 1: Core Concepts & Definitions
Understanding the fundamental definitions is the first step to conquering this topic. We'll explore the key theories you need to know for your O Level Chemistry 5070 or IGCSE Chemistry 0620 exam[citation:1][citation:6].
1. The Arrhenius Theory (The Foundation)
Proposed by Svante Arrhenius in 1884, this is the simplest definition and the one most frequently tested[citation:1].
- Arrhenius Acid: A substance that increases the concentration of H⁺ ions (protons) when dissolved in water[citation:1]. Example: HCl → H⁺ + Cl⁻
- Arrhenius Base: A substance that increases the concentration of OH⁻ ions (hydroxide ions) when dissolved in water[citation:1]. Example: NaOH → Na⁺ + OH⁻
Key Fact: Free H⁺ ions don't really exist in water. They instantly bond with a water molecule to form the hydronium ion, H₃O⁺[citation:1]. So, HCl(aq) + H₂O(l) → H₃O⁺(aq) + Cl⁻(aq).
2. Physical Properties: How to Identify Them
You can often identify acids and bases by their observable properties[citation:4][citation:10].
| Property | Acids | Bases |
|---|---|---|
| Taste | Sour (e.g., lemon juice, vinegar)[citation:5] | Bitter (e.g., soap, baking soda)[citation:5] |
| Touch/Texture | Usually feel like water. | Feel soapy and slippery[citation:4]. |
| Effect on Litmus | Turn blue litmus paper red[citation:5]. | Turn red litmus paper blue[citation:5]. |
| pH Value | pH < 7[citation:4] | pH > 7[citation:4] |
| Reaction with Metals | React with many metals to produce a salt and hydrogen gas (H₂)[citation:2][citation:10]. | Typically do not react with most metals[citation:4]. |
3. What is a Salt?
A salt is an ionic compound formed when an acid reacts with a base, a process called neutralization[citation:5][citation:6].
General Equation: Acid + Base → Salt + Water[citation:2]
For example: Hydrochloric Acid + Sodium Hydroxide → Sodium Chloride + Water[citation:2]
HCl(aq) + NaOH(aq) → NaCl(aq) + H₂O(l)
Salts are made up of positive ions (cations, often from the base) and negative ions (anions, from the acid). Not all salts are neutral—their pH in water depends on the strength of the parent acid and base[citation:3][citation:9].
Part 2: Common Acids & Bases in Daily Life and the Lab
Chemistry isn't just in textbooks. Here are examples you encounter every day[citation:5][citation:8].
🛒 Everyday Acids
- Citric Acid: In lemons, oranges, and other citrus fruits.
- Acetic Acid (CH₃COOH): The main component of vinegar[citation:8].
- Lactic Acid: Found in yogurt and sour milk.
- Tartaric Acid: In tamarind and grapes.
- Carbonic Acid (H₂CO₃): In carbonated soft drinks.
- Hydrochloric Acid (HCl): A strong acid found in our stomach gastric juices[citation:8].
🧼 Everyday Bases
- Sodium Hydroxide (NaOH, Caustic Soda): In drain and oven cleaners[citation:8].
- Calcium Hydroxide (Ca(OH)₂, Slaked Lime): Used in mortar and whitewash[citation:8].
- Ammonia (NH₃): In many household glass and surface cleaners[citation:8].
- Magnesium Hydroxide (Mg(OH)₂): The active ingredient in "Milk of Magnesia," an antacid.
- Sodium Bicarbonate (NaHCO₃, Baking Soda): Used in baking and as a mild cleaning agent.
Part 3: Key Reactions You MUST Know (with Equations)
This is the heart of the exam. Memorize the patterns, not just individual equations[citation:2][citation:10].
🎯 Exam Tip:
For O Level Chemistry 5070 past papers and IGCSE Chemistry 0620 past papers, you are almost always required to write balanced chemical equations. Practice these general patterns!
1. Acid + Metal → Salt + Hydrogen Gas
A classic test for acids[citation:2][citation:10].
- Example: Zinc + Hydrochloric Acid → Zinc Chloride + Hydrogen[citation:10]
Zn(s) + 2HCl(aq) → ZnCl₂(aq) + H₂(g) - Why it matters: The "pop" test for hydrogen gas is a frequent O Level Chemistry 5070 ATP (Alternative to Practical) question.
2. Acid + Base (Neutralization) → Salt + Water
The most fundamental acid-base reaction[citation:2][citation:6].
- Example: Sulfuric Acid + Sodium Hydroxide → Sodium Sulfate + Water[citation:8]
H₂SO₄(aq) + 2NaOH(aq) → Na₂SO₄(aq) + 2H₂O(l) - Net Ionic Equation: The core of any strong acid-strong base neutralization is: H⁺(aq) + OH⁻(aq) → H₂O(l)[citation:2].
3. Acid + Metal Carbonate → Salt + Water + Carbon Dioxide
Another key test for acids[citation:4][citation:10].
- Example: Calcium Carbonate (Marble) + Hydrochloric Acid → Calcium Chloride + Water + CO₂
CaCO₃(s) + 2HCl(aq) → CaCl₂(aq) + H₂O(l) + CO₂(g) - Why it matters: The effervescence (fizzing) due to CO₂ is a standard identification test.
4. Acidic/Amphoteric Oxides & Basic Oxides
Oxides also show acid-base character[citation:10].
- Acidic Oxide + Base → Salt + Water: e.g., CO₂ + Ca(OH)₂ (limewater) → CaCO₃ + H₂O[citation:10].
- Basic Oxide + Acid → Salt + Water: e.g., CuO + H₂SO₄ → CuSO₄ + H₂O[citation:10].
- Amphoteric Oxides (e.g., Al₂O₃, ZnO) react with both acids and strong bases[citation:4].
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Part 4: pH, Salt Hydrolysis, and Predicting Salt Acidity
Why is NaCl neutral but NH₄Cl acidic? The answer lies in hydrolysis[citation:3].
The pH of Salts: The 4 Rules
When a salt dissolves, its ions can react with water. This is hydrolysis. Use this table to predict the pH of a salt solution[citation:3]:
| Salt Made From... | Example | pH of Solution | Reason (Hydrolysis) |
|---|---|---|---|
| Strong Acid + Strong Base | NaCl (HCl + NaOH) | = 7 (Neutral) | Neither ion reacts with water. Spectator ions only[citation:3]. |
| Strong Acid + Weak Base | NH₄Cl (HCl + NH₃) | < 7 (Acidic) | The cation (NH₄⁺) from the weak base donates H⁺ to water[citation:3]. |
| Weak Acid + Strong Base | CH₃COONa (CH₃COOH + NaOH) | > 7 (Basic/Alkaline) | The anion (CH₃COO⁻) from the weak acid accepts H⁺ from water, leaving OH⁻[citation:3]. |
| Weak Acid + Weak Base | CH₃COONH₄ | ≈ 7 (Near Neutral)* | Depends on relative strengths (Ka vs Kb). Usually close to 7[citation:3]. |
*Requires comparison of acid and base dissociation constants (Ka, Kb) for exact pH.
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📝 Top 5 Exam Strategies for Acids, Bases, Salts
- Memorize the Reaction Patterns: Acid+Metal, Acid+Carbonate, Neutralization. Write them out daily.
- Know Your Tests: H₂ (pop test), CO₂ (limewater turns milky), NH₃ (turns damp red litmus blue).
- Predict Salt pH: Use the 4 rules from Part 4. This is a high-mark discriminator question.
- Practice Ionic Equations: Especially the net ionic equation for neutralization (H⁺ + OH⁻ → H₂O).
- Use the O Level Chemistry Formula Sheet: Know what's on it and how to use it fast.
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Download comprehensive, exam-focused notes for every major topic. Click the links to get the PDFs from Google Drive.
Pro Tip: Combine these with the Save My Exams Notes for IGCSE Chemistry 0620 for unbeatable revision.
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Live Class Schedule: Weekly classes on Stoichiometry & Moles, Organic Chemistry, and Acids & Bases Revision. New batch starting soon. Check the updated syllabus & schedule here.
Watch a full O Level Paper 4 solved: See Prof. Janjowa's problem-solving approach in action.
Part 6: Last-Minute Revision & Cheat Sheets
Crunch time? These resources are your lifesaver.
- Last Minute Revision Notes for O Level Chemistry 5070
- O Level Chemistry Notes PDF (All Chapters)
- How to Calculate Empirical Formulas Easily (Related to salt formulas)
Ultimate Cation/Anion & Gas Test Cheat Sheet
Memorize this table for identification questions in Paper 4 (ATP).
Learn the Periodic Table in a Song!
Knowing Group I & II metals (which react with acids) and Group VII (halogens, part of acids) is crucial. This makes it fun!
Frequently Asked Questions (FAQs)
Step 1: Litmus Test. Blue to Red = Acid. Red to Blue = Base. No change could be a neutral salt (but not always).
Step 2: Reaction Tests. If it's an acid, it will fizz with a carbonate or a reactive metal. A base will feel soapy.
Step 3: pH Measurement. Use universal indicator or a pH probe for a definitive number[citation:4][citation:5].
Neither. NaCl is a neutral salt. It is formed from a strong acid (HCl) and a strong base (NaOH). When dissolved, neither Na⁺ nor Cl⁻ ions react with water, so the pH remains 7[citation:3][citation:9].
Stomach pain can be from excess hydrochloric acid (HCl). Antacids like magnesium hydroxide (Mg(OH)₂) are bases. They undergo a neutralization reaction with the stomach acid: Mg(OH)₂ + 2HCl → MgCl₂ + 2H₂O. This reduces acidity and relieves pain[citation:8][citation:10].
This is a common confusion! Strength refers to how completely an acid dissociates into ions. A strong acid (like HCl) dissociates 100%. A weak acid (like CH₃COOH) does not. Concentration is about how much acid is dissolved in a given volume of water. You can have a dilute strong acid or a concentrated weak acid[citation:1][citation:10].
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![🎓 Cambridge Grade Thresholds 2026 – Your Complete Guide to Results Day Results Day is finally here! Whether you're celebrating a well-deserved A* or planning your next steps, Cambridge Classroom has everything you need to understand your grades and prepare for the journey ahead. What Are Grade Thresholds? Grade thresholds (also known as grade boundaries) are the minimum marks required to achieve each grade in a Cambridge examination. After every exam session, Cambridge International publishes official grade threshold tables showing exactly how many raw marks you needed for an A*, A, B, C, and so on. Here's the key thing to understand: grade boundaries change every year. They depend on the difficulty of the papers and how the entire cohort of students performed. A mark that gave you an A* in one session might give you an A in another – and that's completely normal. For example: In the June 2025 session, the A* threshold for O Level Chemistry 5070 was 169 out of 200 marks. That means if you scored 169 or above, you achieved the top grade. Anything below that fell into the A, B, or lower categories. 📥 Download Grade Thresholds for Every Subject – FREE! Cambridge Classroom is proud to offer free PDF downloads of grade threshold tables for all Cambridge IGCSE and O Level subjects. Whether you took: Chemistry (5070 / 0620) Physics (0625) Biology (0610) Mathematics (0580) English (0500) Accounting (0452) Art & Design (0400) or any other Cambridge subject – we have your grade threshold PDF ready for download. 👉 [Download your subject's grade threshold PDF here – completely FREE!] 🎉 To Those Who Achieved Their Goals – CONGRATULATIONS! If you're reading this with the grades you worked so hard for – we are so proud of you! 🎊 Those late-night study sessions, the endless past papers, the moments of doubt, and the moments of breakthrough – it all paid off. You've proven that dedication, smart preparation, and consistent effort lead to success. 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Here's what makes it outstanding and unlike any other app on the internet: 🔍 1. Past Papers – The World's Largest Collection Huge collection of past papers – search, download, print, and share easily Write directly on papers within the app – no need for separate apps Auto-check your papers – students can instantly verify their answers Live question-by-question checking to improve learning in real-time All data stored online, not on your device – no memory issues Share papers easily across devices and social apps 📅 2. Timetable – Never Miss a Class Again Add events, lessons, periods with reminders Multiple reminders for a single event – you'll never miss anything Analog and digital clocks with 12h/24h options Week-wise view of all events Share your timetable via WhatsApp, Instagram, Facebook, Twitter, SMS Download and share schedules as PDFs Add beautiful wedges to your home screen for quick views 👨🏫 3. Teachers' Lounge – The Ultimate All-in-One Tool Dashboard with next events, To-Do Lists, performance analytics Quick Insights for tasks, assignments, and reminders Attendance Marking – track present, absent, leave, and even students who bunk classes Copy Checking Record – track submissions, status, and absences Royal Canvas – draw on blank or lined canvas, import images and PDFs, write or draw smoothly Grading Tab – track all assessments, quizzes, tests, and presentations Exam Marking – import images/PDFs, mark, comment, and analyze responses Analytics – charts for class and student performance, custom reports with %, grades, attendance, averages, and class positions Students Tab – multiple contacts, active/deactive status, fee records Schools Tab – add multiple institutions (perfect for visiting faculty!) Finance Tab – track earnings, savings, pending fees, send reminders via WhatsApp/SMS Data Vault – export/import database, auto-sync with Google Drive, use across devices 📚 4. Resources – Premium Learning Materials Library of notes, tips, and reading materials Ultra Premium, Ultra Realistic, Full HD simulations – make complex topics easy to understand Top-notch feature not available in any other app 📲 Download Now and Start Your Journey to Better Grades! 👉 Download Cam Class Pro: Papers & Notes from Google Play "In all other apps, there's only one institution option – but in Cam Class Pro, I can add all my institutions. Thanks to Cambridge Classroom!" – A visiting faculty member "The Royal Canvas helped me enormously in online teaching. There's no such app on the internet with these features." – A teacher 🔬 For Chemistry Students – Enroll in the Crash Course! If you're taking O Level Chemistry 5070 or IGCSE Chemistry 0620 and want to guarantee an A*, Cambridge Classroom offers the Ultimate Chemistry Crash Course. Why This Crash Course is Different: 100% Syllabus-Aligned – no wasting time on irrelevant AQA or AP content No Ads, No Distractions – every minute is focused learning Expert Guidance – taught by Prof. Faisal Mehmood Janjowa (The Chemistry Guru) with 15+ years of experience and 1000+ solved past papers Live Classes – interactive, engaging, and exam-centered Proven Results – 95% A/A success rate* – students hit the June 2025 A* threshold of 169/200 easily Complete Syllabus in 8 Hours – ideal for late starters and re-sitters Course Structure: Week 1: Core Principles (Atoms, Elements, Stoichiometry) Week 2: Energetics & Reaction Rates Week 3: Acids, Bases, Salts & Qualitative Analysis Week 4: Intensive Organic Chemistry Week 5: Past Paper Solving (P1 & P2) Week 6: ATP Masterclass & Mock Exams "I jumped from a C to an A in 6 weeks! Prof. Faisal's live classes are incredible."* – Aisha, O Level Student "The P1 Past Papers session is a lifesaver. The logic used to explain MCQs is exactly what Cambridge requires. Best investment ever." – Omar, IGCSE 0620 Student 👉 Enroll in the Chemistry Crash Course 5070 & 0620 Now 📊 What Do the Grade Thresholds Mean for You? Grade Typical Range What It Means A* 90–100% Exceptional performance – minimal errors A 80–89% Strong mastery of all topics B 70–79% Good understanding with some gaps C 60–69% Satisfactory achievement D 50–59% Basic understanding E 40–49% Elementary knowledge Note: These percentages are indicative only. Actual thresholds vary by subject and session. Always check the official threshold PDF for your specific subject and exam series. 🚀 Your Next Steps: ✅ If you're happy with your results: Confirm your next steps – college, sixth form, or university applications Download your grade threshold PDF for reference Share your success with friends and family 🔄 If you need to improve: Download Cam Class Pro App – start practicing with past papers today Enroll in the Chemistry Crash Course (if you're a chemistry student) Set a study schedule using the app's timetable feature Track your progress with analytics and grading tools 📝 For everyone: Bookmark Cambridge Classroom for all your study resources Share this guide with fellow students Subscribe for updates on new resources and courses 🌟 Why Cambridge Classroom? Cambridge Classroom is the #1 destination for Cambridge students worldwide because we offer: FREE grade threshold PDFs for all subjects The most comprehensive past papers library The Cam Class Pro App – the only all-in-one study app with features no other app has Expert-led crash courses with proven 95% A/A* success rates Ultra Premium resources including Full HD simulations and Royal Canvas 📌 Quick Links: 📱 Download Cam Class Pro App: Google Play Link 🔬 Chemistry Crash Course: Enroll Now 📥 Grade Thresholds PDFs: [Download Here – Coming Soon!] 🌐 Cambridge Classroom: www.CambridgeClassroom.com 💬 Final Words Results Day is just one day. Your potential is lifelong. Whether you're celebrating or planning your comeback, Cambridge Classroom is here to support you every step of the way. Download the app, enroll in the course, and take control of your academic future today. You've got this. We've got your back. 💪 Share this post with fellow Cambridge students! Let's help everyone achieve their best grades. #CambridgeResults #IGCSEResults #OLevelResults #GradeThresholds #CambridgeClassroom #CamClassPro #ChemistryCrashCourse #ResultsDay2026](https://i0.wp.com/cambridgeclassroom.com/wp-content/uploads/2026/08/grade-thresholds-for-may-june-2026.jpg?fit=300%2C158&ssl=1)




















