Q1 of 27 Page 27

The correct way of making a solution of acid in water is to

Adding water to acids release energy. We can experience it by touching at test tube (it becomes hot), sometimes the heat is too large to handle and glasses of container or test tube may explode and acid can spill over. So we always take water in excess and drop acid drop by drop, so that heat produced can be cooled down by this water and accidents can be prevented.

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10

On adding phenolphthalein indicator to a colourless solution, no change is observed. What is the nature of this solution?

 11

Which of the following is an acid-base indicator?

 12

Look at the given reaction.

Hydrochloric acid + Sodium hydroxide (base) → Sodium chloride (salt) + Water


Sodium chloride formed in this reaction remains in solution form. Can we get solid sodium chloride from this solution? Suggest a method (if any).

 13

State whether the following statements are true or false. Correct the false statements.

(a) All substances are either acidic or basic.


(b) A compound if acidic will turn all indicators red.


(c) Lime water turns red litmus blue.


(d) Common salt dissolved in water turns blue litmus red.


(e) Phenolphthalein is a natural indicator.


(f) Calamine can be used to treat ant’s sting.


(g) Lemon water is basic in nature.