Class 10 Science – Acids, Bases and Salts | Interactive Visual Revision Notes

📚 Section 1 — Classroom Notes

Real-World Connection: Every time you squeeze a lemon into water, you are making an acid solution. When you mix baking soda with vinegar to unclog a drain, an acid reacts with a base. Acids and bases are not just lab chemicals — they are at work in your kitchen, stomach, and even in the rain!

🔍 Topic 1: What Are Acids?

Acids taste sour like lemon juice.
Acids turn blue litmus paper red.
Acids have H+ ions in water.
Example: HCl is hydrochloric acid.
Never taste chemicals in the lab!

🧴 Topic 2: What Are Bases?

Bases taste bitter like soap water.
Bases turn red litmus paper blue.
Bases have OH- ions in water.
Example: NaOH is sodium hydroxide.
Bases feel slippery when you touch them.

🏷️ Topic 3: Indicators

Indicators change color with acid or base.
Litmus comes from a lichen plant.
Turmeric turns red with a base.
Phenolphthalein turns pink with a base.
Methyl orange turns red with an acid.

⚗️ Topic 4: Acids React with Metals

Acid plus metal gives salt and hydrogen.
Hydrogen gas makes a pop sound test.
Zinc with HCl gives ZnCl₂ and H₂.
Not all metals react with acids.
Gold and silver do not react.

💧 Topic 5: Acids React with Carbonates

Acid plus carbonate gives salt, water, CO₂.
CO₂ gas turns lime water milky.
Baking soda with vinegar makes bubbles.
This test shows an acid is present.
Carbonates are found in limestone rocks.

🤝 Topic 6: Neutralisation

Acid plus base gives salt and water.
This is called a neutralisation reaction.
Antacid tablet neutralises extra stomach acid.
The product is always a salt.
Heat is given out in neutralisation.

📏 Topic 7: The pH Scale

pH scale goes from 0 to 14.
pH below 7 means the liquid is acidic.
pH equal to 7 means it is neutral.
pH above 7 means it is basic.
Our blood pH is about 7.4.

🌿 Topic 8: Why pH Is Important

Plants grow best in a set pH range.
Our stomach uses HCl at pH 1.5.
Tooth decay happens below pH 5.5.
Bee sting is acidic so use baking soda.
Soil pH affects crop growth a lot.

🧂 Topic 9: Common Salt and Its Products

Common salt is sodium chloride or NaCl.
Salt is made from sea water drying.
Rock salt is mined from the earth.
Salt is used to make many chemicals.
Electrolysis of salt gives NaOH and Cl₂.

🏗️ Topic 10: Important Salts

Baking soda is NaHCO₃ used in cooking.
Washing soda is Na₂CO₃ used for cleaning.
Bleaching powder cleans water and clothes.
Plaster of Paris is used to set bones.
Each salt has a special use in life.

✏️ Section 3 — Worked Examples

📝 Example 1: Find the pH Type

A solution has pH = 3. Is it acid, base, or neutral?

pH scale goes from 0 to 14.

pH below 7 means it is acidic.

pH 3 is below 7.

Answer: The solution is acidic.

📝 Example 2: Neutralisation Reaction

What happens when HCl reacts with NaOH?

HCl is an acid. NaOH is a base.

Acid + Base = Salt + Water.

The salt formed here is NaCl.

Water or H₂O is also formed.

Answer: HCl + NaOH → NaCl + H₂O

📝 Example 3: Acid with Carbonate

What gas forms when acid meets baking soda?

Baking soda is sodium hydrogen carbonate.

Acid reacts with carbonate to give CO₂.

CO₂ turns lime water milky.

Answer: Carbon dioxide gas (CO₂) is formed.

📋 Section 4 — Cheat Sheet

Word	Meaning
Acid	Gives H+ ions in water, tastes sour.
Base	Gives OH- ions in water, tastes bitter.
Indicator	Changes color to show acid or base.
Litmus	A dye from lichen that tests acids.
pH Scale	Measures how acidic or basic from 0-14.
Neutral	Not acid, not base. pH is 7.
Neutralisation	Acid + Base = Salt + Water.
Salt	Product when acid reacts with base.
Baking Soda	NaHCO₃, used in cooking and cleaning.
Washing Soda	Na₂CO₃, used for cleaning clothes.
Bleaching Powder	CaOCl₂, cleans water, removes color.
Plaster of Paris	Sets broken bones, used in crafts.

🏠 Section 5 — Take-Home Handout

Part A: Fill in the Blanks

1. Acids taste ________ like lemon.

2. Bases turn red litmus paper ________.

3. pH of pure water is ________.

4. Acid + Base = Salt + ________.

5. Baking soda has the formula ________.

Part B: True or False

1. Acids turn red litmus paper blue. ________

2. pH 2 means a liquid is very acidic. ________

3. Bases feel slippery when touched. ________

4. Common salt has the formula KCl. ________

5. Plaster of Paris is used to fix bones. ________

Part C: Solve

1. A liquid has pH 11. Is it acid or base?

2. Write the reaction: HCl + NaOH = ?

Part D: Match the Columns

Column A	Column B
1. Baking Soda	a. CaOCl₂
2. Washing Soda	b. NaHCO₃
3. Bleaching Powder	c. NaCl
4. Common Salt	d. Na₂CO₃

Part E: Draw and Label

Draw the pH scale from 0 to 14. Mark acid, neutral, and base zones.

✅ Detailed Solutions — Section 5 Take-Home Handout

Part A: Fill in the Blanks

1. Acids taste sour like lemon.

2. Bases turn red litmus paper blue.

3. pH of pure water is 7.

4. Acid + Base = Salt + water.

5. Baking soda has the formula NaHCO₃.

Part B: True or False

1. Acids turn red litmus paper blue. → False — Acids turn blue litmus paper red; it is bases that turn red litmus blue.

2. pH 2 means a liquid is very acidic. → True — A pH below 7 is acidic; pH 2 is strongly acidic (like battery acid).

3. Bases feel slippery when touched. → True — Bases react with the oils on skin, making them feel slippery or soapy.

4. Common salt has the formula KCl. → False — Common salt is NaCl (sodium chloride); KCl is potassium chloride.

5. Plaster of Paris is used to fix bones. → True — Plaster of Paris (CaSO₄½H₂O) sets hard and is used in casts for broken bones.

Part C: Solve

1. A liquid has pH 11. Is it acid or base?

pH scale: 0–6 = acid, 7 = neutral, 8–14 = base.

pH 11 > 7, so the liquid is a base (alkali).

Example of a liquid with pH ~11: household ammonia solution.

2. Write the reaction: HCl + NaOH = ?

HCl is a strong acid; NaOH is a strong base.

Acid + Base → Salt + Water (neutralisation reaction).

HCl + NaOH → NaCl + H₂O ✅ — the salt formed is common salt.

Part D: Match the Columns

1. Baking Soda → b. NaHCO₃ (sodium hydrogen carbonate; used in cooking and antacids)

2. Washing Soda → d. Na₂CO₃ (sodium carbonate; used for cleaning and water softening)

3. Bleaching Powder → a. CaOCl₂ (calcium oxychloride; used to disinfect water)

4. Common Salt → c. NaCl (sodium chloride; everyday table salt)

Part E: Draw and Label — The pH Scale

Your diagram should show a horizontal bar from 0 to 14 with:

Numbers 0–6 coloured red/orange, labelled ACID (examples: HCl, lemon juice, vinegar)
Number 7 coloured green, labelled NEUTRAL (example: pure water)
Numbers 8–14 coloured blue/purple, labelled BASE/ALKALI (examples: NaOH, soap, bleach)
Arrows showing the direction «More acidic» and «More basic»

🧪 Class 10 Science — Acids, Bases and Salts
Original Visual Revision Notes Aligned with the Class 10 Science syllabus. Independently created study material. Not affiliated with or endorsed by NCERT.

📖 Table of Contents

📚 Section 1 — Classroom Notes

🔍 Topic 1: What Are Acids?

🧴 Topic 2: What Are Bases?

🏷️ Topic 3: Indicators

⚗️ Topic 4: Acids React with Metals

💧 Topic 5: Acids React with Carbonates

🤝 Topic 6: Neutralisation

📏 Topic 7: The pH Scale

🌿 Topic 8: Why pH Is Important

🧂 Topic 9: Common Salt and Its Products

🏗️ Topic 10: Important Salts

🎨 Section 2 — Easy Illustrations

✏️ Section 3 — Worked Examples

📝 Example 1: Find the pH Type

📝 Example 2: Neutralisation Reaction

📝 Example 3: Acid with Carbonate

📋 Section 4 — Cheat Sheet

🏠 Section 5 — Take-Home Handout

Part A: Fill in the Blanks

Part B: True or False

Part C: Solve

Part D: Match the Columns

Part E: Draw and Label

✅ Detailed Solutions — Section 5 Take-Home Handout

Part A: Fill in the Blanks

Part B: True or False

Part C: Solve

Part D: Match the Columns

Part E: Draw and Label — The pH Scale

🎴 Section 6 — Revision Flashcards

🧠 Section 7 — Mind Map

🧪 Class 10 Science — Acids, Bases and SaltsOriginal Visual Revision Notes Aligned with the Class 10 Science syllabus. Independently created study material. Not affiliated with or endorsed by NCERT.

📖 Table of Contents

📚 Section 1 — Classroom Notes

🔍 Topic 1: What Are Acids?

🧴 Topic 2: What Are Bases?

🏷️ Topic 3: Indicators

⚗️ Topic 4: Acids React with Metals

💧 Topic 5: Acids React with Carbonates

🤝 Topic 6: Neutralisation

📏 Topic 7: The pH Scale

🌿 Topic 8: Why pH Is Important

🧂 Topic 9: Common Salt and Its Products

🏗️ Topic 10: Important Salts

🎨 Section 2 — Easy Illustrations

✏️ Section 3 — Worked Examples

📝 Example 1: Find the pH Type

📝 Example 2: Neutralisation Reaction

📝 Example 3: Acid with Carbonate

📋 Section 4 — Cheat Sheet

🏠 Section 5 — Take-Home Handout

Part A: Fill in the Blanks

Part B: True or False

Part C: Solve

Part D: Match the Columns

Part E: Draw and Label

✅ Detailed Solutions — Section 5 Take-Home Handout

Part A: Fill in the Blanks

Part B: True or False

Part C: Solve

Part D: Match the Columns

Part E: Draw and Label — The pH Scale

🎴 Section 6 — Revision Flashcards

🧠 Section 7 — Mind Map

🧪 Class 10 Science — Acids, Bases and Salts
Original Visual Revision Notes Aligned with the Class 10 Science syllabus. Independently created study material. Not affiliated with or endorsed by NCERT.