Hassan was making potassium sulphate by adding potassium carbonate powder to some sulphuric acid. During the final stages of reaction, the potassium carbonate did not fizz when it was added. When Hassan measured the pH he found it was 10.5.

Explain his result.

Salts can be prepared by the reaction of acids with metals.

Complete the equation:

$Acid + metal \stackrel{}{\to salt + \_\_\_\_\_}$

Salts can be prepared by the reaction of acids with metals.

Choose the word that best describes the reaction.

Sodium sulphate is an important salt used to make detergents.

The table lists some substances. Tick the name of the acid used to make detergents.

Sodium sulphate can be made by the reaction of an acid and carbonate.

Complete the word equation for this reaction.

$\mathrm{\_\_\_\_\_} \mathrm{carbonate} + \mathrm{\_\_\_\_\_} \mathrm{acid} \stackrel{}{\to \mathrm{Sodium} \mathrm{sulphate} + \mathrm{\_\_\_\_\_} + \mathrm{\_\_\_\_\_}}$

Some indigestion tablets contain calcium carbonate which neutralises excess stomach acid (hydrochloric acid)

Complete the word equation for the reaction.

$\mathrm{Calcium} \mathrm{carbonate} + \mathrm{hydrochloric} \mathrm{acid} \underset{}{\to } \mathrm{\_\_\_\_\_} + \mathrm{\_\_\_\_\_} + \mathrm{\_\_\_\_\_}$

Some indigestion tablets contain calcium carbonate which neutralises excess stomach acid (hydrochloric acid)

How does the pH change in the stomach after taking these tablets?