To make a mixture which can dissolve gold, nitric acid and hydrochloric acid are to be mixed in the ratio 3 : 1. With 12 milliliters of hydrochloric acid, how much nitric acid should be mixed?

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Solution

Ratio of nitric acid to hydrochloric acid in the mixture = 3 : 1

Quantity of hydrochloric acid = 12 millilitres

Quantity of nitric acid to be mixed = × quantity of hydrochloric acid

= 3 × 12 millilitres

= 36 millilitres

Thus, 36 millilitres of nitric acid should be mixed with 12 millilitres of hydrochloric acid to form the mixture.

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