Q1 of 270 Page 96

What is the chemical formula of

(a) baking soda, and


(b) washing soda?

(a) Baking soda- NaHCO3. (b) Washing soda- Na2CO3.


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62 A group of students measured the pH of some substances they found in their homes. Their results are given in the following table:


(a) What would the students have used to measure the pH?


(b) Which solution is the most acidic?


(c) Which solution is the most alkaline?


(d) Which solutions are neutral?


(e) Which solution can be used to treat wasp stings?


(f) Which solution can be used to treat bee stings?

 63 Hydrochloric acid reacts with a metal X to form a gas Y which burns with a 'pop' sound. Sodium hydroxide solution also reacts with the same metal X (on heating) to form the same gas Y.

(a) Name X and Y


(b) Write the chemical equation of the reaction of metal X with


(i) hydrochloric acid, and


(ii) sodium hydroxide solution.

 2

Write the chemical formula of (i) soda ash, and

(ii) sodium carbonate decahydrate.

 3

State whether the following statement is true or false:

Copper sulphate crystals are always wet due to the presence of water of crystallization in them.