Answer to Question #254784 in Physical Chemistry for Cfd

Question

a container containing 5 litres of a commercial sample of hydrochloric acid (36.2 % by weight with a density of 1.19 g/ml) developed a crack and all the HCl was spilt on the floor. It can be neutralised with limestone powder. [atomic masses: Ca = 40, C = 12, O = 16] (a) Write the equation for the reaction between limestone and hydrochloric acid. (b) How many moles of hydrochloric acid was spilt? (c) How many moles of calcium carbonate will neutralise the acid? (d) What minimum mass of limestone powder is needed to neutralise the acid if the limestone is 70% pure?

Answer 1

Calcium carbonate is found naturally in limestone . When limestone is heated strongly, the calcium carbonate it contains absorbs heat (endothermic ) and decomposes to form calcium oxide. This is indicated by an orange glow as the limestone is heated.