Large marble chips (calcium carbonate) were reacted with 1M hydrochloric acid at 24 C. The volume of carbon dioxide evolved was measured at regular intervals.

a) Describe one other way of measuring the course of this reaction which does not involve measuring the volume of carbon dioxide given off.

b) Describe how the following would affect the speed of this reaction, ( In each case, assume that all other factors are kept the same.)

i. using 0.05 M hydrochloric acid

ii. using smaller marble chips

iii. carrying out the reaction at 22 C.