Two acids '$\mathrm{A}$' and '$\mathrm{B}$' are given. Acid $\mathrm{A}$ gives one hydrogen ion per molecule of the acid in solution. Acid $\mathrm{B}$ gives two hydrogen ions per molecule of the acid in solution. Find out acid $\mathrm{A}$ and acid $\mathrm{B}$.

Correct the mistakes in the following:

Washing soda is used for making cakes and bread soft and spongy.

Correct the mistakes in the following:

Calcium sulphate hemihydrate is used in textile industry.

Differentiate hydrate and anhydrous salts with examples.

Write any four uses of bases.