Some students investigated the rate of reaction between large calcium carbonate chips and dilute hydrochloric acid:
CaCO3(s)+2HCl(aq)→CaCl2(aq)+H2O(l)+CO2(g)\text{CaCO}_3(\text{s}) + 2\text{HCl}(\text{aq}) \rightarrow \text{CaCl}_2(\text{aq}) + \text{H}_2\text{O}(\text{l}) + \text{CO}_2(\text{g})CaCO3(s)+2HCl(aq)→CaCl2(aq)+H2O(l)+CO2(g)
a.[2]
Describe a test to identify the gas produced in this reaction and give the result of the test.
b.[4]
Using the graph below, determine the mean rate of reaction in cm3/s\text{cm}^3/\text{s}cm3/s between 111 and 333 minutes. Give your answer to 222 significant figures.
