Chalk is almost pure calcium carbonate. We can work out its purity by measuring how much carbon dioxide is given off when it reacts with HCl. 15 g of chalk was reacted with an excess of dilute hydrochloric acid. 2.24 liters of carbon dioxide gas was collected at standard temperature and pressure (STP). The equation for the reaction is : CaCO3(s)+2HCl(aq)→CaCl2(aq)+H2O(l)+CO2(g) Calculate the percentage purity. (Assume that impurity present does not produce CO2)

Chalk is almost pure calcium carbonate. We can work out its purity by

1.	Chalk is almost pure calcium carbonate. We can work out its purity by measuring how much carbon dioxide is given off when it reacts with HCl. 15 g of chalk was reacted with an excess of dilute hydrochloric acid. 2.24 liters of carbon dioxide gas was collected at standard temperature and pressure (STP). The equation for the reaction is : CaCO3(s)+2HCl(aq)→CaCl2(aq)+H2O(l)+CO2(g) Calculate the percentage purity. (Assume that impurity present does not produce CO2)
Answer» Chalk is almost pure calcium carbonate. We can work out its purity by measuring how much carbon dioxide is given off when it reacts with $H C l$ . $15 g$ of chalk was reacted with an excess of dilute hydrochloric acid. 2.24 liters of carbon dioxide gas was collected at standard temperature and pressure (STP). The equation for the reaction is : $C a C O_{3} (s) + 2 H C l (a q) \to C a C l_{2} (a q) + H_{2} O (l) + C O_{2} (g)$ Calculate the percentage purity. (Assume that impurity present does not produce $C O_{2}$ )