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The chemical reaction between marble and...

The chemical reaction between marble and dilute HCl is given.
` CaCO_3 + 2HCl rarr CaCl_2 + H_2O + CO_2`
a) Which gas is formed here? How can you identify the gas?
b) Suggest any two ways you would choose to increase the rate of this chemical reaction. Explain the reason.

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a) Carbon dioxide. When carbon dioxide gas is passed through the clear lime water, it turns milky.
b) Increases the concentration of the acid.
Use powdered marble.
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