2HCl(aq) + CaCO3(s) → CaCl2(s) + CO2(g) + H2O(l). From the curves L, M, N, P, which represents the production of CO2 gas as dilute HCl is added?
L
M
N
P
0
Correct answer: M.
Explanation: When dilute HCl is added to solid CaCO3, CO2 is evolved rapidly at first, then the rate slows as one reactant is used up, and finally no more gas is produced. Thus, the graph of volume of CO2 produced versus time (or acid added) rises quickly and then levels off to a plateau. Among the curves L, M, N, P, this behavior corresponds to M.
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