Question

Pure calcium carbonate and dilute hydrochloric acid are reacted and 2 litres of carbon dioxide were collected at 27°C and normal pressure.

\[\ce{CaCO3 + 2HCl -> CaCl2 + H2O + CO2}\]

Calculate the mass of the acid required.

Answer 1

Given: 

V₁ = 2 litres                            V₂ = ?

T₁ = (273 + 27) = 300°K         T₂ = 273°K

As we know, `"V"_1/"T"_1 = "V"_2/"T"_2`

∴ V2 = `("V"_1"T"_2)/"T"_1`

= `[[2 × 273]/300]`L

22.4 litres of CO₂ are prepared from acid = 73 g

∴ `((2 xx 273)/300)` litres are prepared from 

= `73/22.4 xx (2 xx 273)/300`

= 5.9 g