Question

(a) Name three acids used in the laboratory.

(b) Name one indicator that turns red on adding a base.

(c) Name the reaction when an acid is mixed with a base.

(d) Write the name of two indicators that occur naturally.

(e) Name three types of salts. Give one example of each type of salt.

Answer 1

(a) Acids that are mostly used in the laboratory as below:

• Hydrochloric acid (HCl)

• Sulphuric acid$\left(H_{2}S{O}_4\right)$

• Nitric acid $\left(HN{O}_3\right)$

(b) Turmeric

(c) Neutralisation reaction.

(d) Natural occurring indicators are:

• Turmeric

• China rose

(e) Type of salts are:-

• Neutral salts e.g. sodium chloride (NaCl)

• Acidic salts e.g. Ammonium chloride $\left(N{H}_{4}Cl\right)$

• Basic salts e.g. sodium hydrogen carbonate $\left(NaHC{O}_3\right)$

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