1. Take lemon juice, orange juice, 1 M NaOH , 1 M HCl , pure water and vinegar. 2. Dip pH paper into these solutions. 3. Observe the changes. S.No. Sample Colour of pH paper Approximate pH Nature of substance 1. Lemon juice 2. Orange juice 3. 1 M NaOH 4. 1 M HCl 5. Pure water 6. Vinegar

S.No. Sample Colour of pH paper Approximate pH Nature of substance 1. Lemon juice Red 2.2-2.4 Acidic S.No. Sample Colour of pH paper Approximate pH Nature of substance 2. Orange juice Orange red 3.5 Acidic S.No. Sample Colour of pH paper Approximate pH Nature of substance 3. 1 M NaOH Violet 13 Highly basic S.No. Sample Colour of pH paper Approximate pH Nature of substance 4. 1 M HCl Dark red less than 1 Highly acidic S.No. Sample Colour of pH paper Approximate pH Nature of substance 5. Pure water Green 7 Neutral S.No. Sample Colour of pH paper Approximate pH Nature of substance 6. Vinegar Orange 3 Acidic S.No. Sample Colour of pH paper Approximate pH Nature of substance 1. Lemon juice Red 2.2-2.4 Acidic 2. Orange juice Orange red 3.5 Acidic 3. 1 M NaOH Violet 13 Highly basic 4. 1 M HCl Dark red less than 1 Highly acidic 5. Pure water Green 7 Neutral 6. Vinegar Orange 3 Acidic

E M B I B E

PRACHI SCIENCE CHEMISTRY CLASS-X>Chapter 2 - Acids, Bases and Salts>Check Your Progress>Q 2

EASY

10th CBSE

IMPORTANT

Earn 100

Why acid should be added to water and not water to the acid?

Important Questions on Acids, Bases and Salts

MEDIUM

10th CBSE

IMPORTANT

PRACHI SCIENCE CHEMISTRY CLASS-X>Chapter 2 - Acids, Bases and Salts>Check Your Progress>Q 3

Why does dry

HCl

gas not change the colour of the dry litmus paper?

MEDIUM

10th CBSE

IMPORTANT

PRACHI SCIENCE CHEMISTRY CLASS-X>Chapter 2 - Acids, Bases and Salts>Check Your Progress>Q 1

Why does the colour of dry blue litmus paper remains unchanged even when it is brought in contact with

HCl

gas?

MEDIUM

10th CBSE

IMPORTANT

PRACHI SCIENCE CHEMISTRY CLASS-X>Chapter 2 - Acids, Bases and Salts>Check Your Progress>Q 2

How does water help in dissociation of acids and bases?

MEDIUM

10th CBSE

IMPORTANT

PRACHI SCIENCE CHEMISTRY CLASS-X>Chapter 2 - Acids, Bases and Salts>Check Your Progress>Q 3

Identify the nature of the following aqueous solutions (whether acidic, basic or neutral)
(a) Solution A: $[H^{+}] < [{OH}^{-}]$
(b) Solution B∶ $[H^{+}] > [{OH}^{-}]$
(c) Solution C∶ $[H^{+}] = [{OH}^{-}]$