pH is measured on a scale of 0 to 14 , with lower values indicating high hydrogen ion concentration (more acidic) and higher values indicating low hydrogen ion concentration (less acidic). A pH of 7 is considered as neutral. Every whole unit in pH represents a ten-fold increase in or decrease in hydrogen ion concentration. What would the hydrogen ion concentration of a solution of pH 4 be compared to a solution of pH 8 ?

Every whole unit in pH represents a ten-fold increase in or decrease in hydrogen ion concentration. H + is the antilog of negative pH . H + = 10 - pH Hydrogen ion concentration of a solution of pH 4 is: H + = 10 - 4 mol / L Hydrogen ion concentration of a solution of pH 8 is: H + = 10 - 8 mol / L H + = 10 - 4 10 - 8 = 10 4 Therefore, Hydrogen ion concentration of a solution of pH = 4 is 10 4 times as compared to that of pH = 8 .

MEDIUM

10th CBSE

IMPORTANT

Earn 100

Sunita carried out the following reactions in the laboratory:

Complete neutralisation of one mole of sodium carbonate with hydrochloric acid

Complete neutralisation of one mole of sodium bicarbonate with hydrochloric acid

She found that the amount of carbon dioxide formed in both the reactions was the same.

Important Questions on Acids, Bases and Salts

MEDIUM

10th CBSE

IMPORTANT

Science Textbook of Competency Based Questions for Class X>Chapter 2 - Acids, Bases and Salts>Exercise>Q 18

Sunita carried out the following reactions in the laboratory:

Complete neutralisation of one mole of sodium carbonate with hydrochloric acid
Complete neutralisation of one mole of sodium bicarbonate with hydrochloric acid

How does the amount of salt formed in case (i) compare with the amount of salt formed in case (ii)?

MEDIUM

10th CBSE

IMPORTANT

Science Textbook of Competency Based Questions for Class X>Chapter 2 - Acids, Bases and Salts>Exercise>Q 19

To prepare a salad dressing, Parag adds a solution of sodium chloride in distilled water to vinegar.

State what change will occur in the following:

The pH of the vinegar
The acidity of the vinegar

MEDIUM

10th CBSE

IMPORTANT

Science Textbook of Competency Based Questions for Class X>Chapter 2 - Acids, Bases and Salts>Exercise>Q 20

Rajesh was given a substance and asked to identify it. He conducted three tests on the substance and recorded the results below. (P) It releases carbon dioxide, water, and a sodium salt on heating with water. (Q) It turns universal indicator greenish-blue. (R) It can be prepared from ammonia as a raw material.

What substance was Rajesh given?

EASY

10th CBSE

IMPORTANT

Science Textbook of Competency Based Questions for Class X>Chapter 2 - Acids, Bases and Salts>Exercise>Q 21

Give one use of the substance based on the properties mentioned in P and Q.

MEDIUM

10th CBSE

IMPORTANT

Science Textbook of Competency Based Questions for Class X>Chapter 2 - Acids, Bases and Salts>Exercise>Q 22

Rajesh later read that recrystallisation of the sodium salt formed in P gives another basic salt that is used in manufacture of borax.

Identify the sodium salt formed in P.

MEDIUM

10th CBSE

IMPORTANT

Science Textbook of Competency Based Questions for Class X>Chapter 2 - Acids, Bases and Salts>Exercise>Q 23

Aditi finds that a mixture of an acid and a base does not change the colour of either red or blue litmus paper. Compare the amounts of

H^{+}

and

{OH}^{-}

in the solution.

HARD

10th CBSE

IMPORTANT

Science Textbook of Competency Based Questions for Class X>Chapter 2 - Acids, Bases and Salts>Exercise>Q 24

pH

is measured on a scale of

0

14

, with lower values indicating high hydrogen ion concentration (more acidic) and higher values indicating low hydrogen ion concentration (less acidic). A

pH

7

is considered as neutral. Every whole unit in

pH

represents a ten-fold increase in or decrease in hydrogen ion concentration. What would the hydrogen ion concentration of a solution of

pH 4

be compared to a solution of

pH 8

HARD

10th CBSE

IMPORTANT

Science Textbook of Competency Based Questions for Class X>Chapter 2 - Acids, Bases and Salts>Exercise>Q 26

Dipti has three flasks containing dilute hydrochloric acid, dilute sulphuric acid and dilute sodium hydroxide respectively. The flasks are not labelled, and she does not have any pH indicator.
(a) Which of the solutions will she be able to identify just by making mixtures of pairs of the substances.
(b) What observation will help her to make this identification?

Important Questions on Acids, Bases and Salts

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