Question

# (i) Explain, why only all glass apparatus should be used for the preparation of nitric acid by heating concentrated sulphuric acid and potassium nitrate. (ii) Write a chemical equation to illustrate the acidic nature of nitric acid.

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Solution

## (i) The preparation of nitric acid involves the use of concentrated sulphuric acid at a temperature of 200oC. Nitric acid vapours are formed in the reaction, and they are highly corrosive. As a result, the apparatus is made of glass to resist the corrosive properties of sulphuric and nitric acids. (ii) The neutralisation of NaOH can be used to demonstrate the acidic nature of nitric acid, as shown below: $\mathrm{NaOH}+{\mathrm{HNO}}_{3}\to {\mathrm{NaNO}}_{3}+{\mathrm{H}}_{2}\mathrm{O}$

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