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WAEC Chemistry 2010 Paper

Question : 11

Total: 38

Solution:

Concept:

The stoichiometric ratio is the ratio of the coefficients of the acid and the base in the balanced chemical equation.

Explanation:

In the reaction, nitric acid

\mathrm{HNO_3}

is the acid and sodium carbonate

\mathrm{Na_2CO_3}

is the base.

The balanced equation shows:

1\mathrm{Na_2CO_3} + 2\mathrm{HNO_3} \rightarrow 2\mathrm{NaNO_3} + \mathrm{H_2O} + \mathrm{CO_2}

So, the coefficient of acid is

2

and the coefficient of base is

1

Therefore, the acid to base ratio is

2:1

Answer:

2:1

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