7.5g of calcium carbonate was placed in a conical flask containing 50cm 3 of dilute hydrochloric acid.
Question:
7.5g of calcium carbonate was placed in a conical flask containing 50cm3 of dilute hydrochloric acid. The flask kept at constant temperature and the volume of carbon (IV) oxide gas evolved was measured at 20 minutes intervals. Not all the calcium carbonate was used up during the reaction the results were recorded in the table below
Time from start of reaction ( minutes) | Volume of Co2 evolved cm3 |
0 | 0 |
20 | 555 |
40 | 810 |
60 | 695 |
80 | 1000 |
120 | 1020 |
(a) Write an equation for the reaction between calcium carbonate and hydrochloric acid ( 1 mk)
(b) Plot a graph volume of carbon (IV) oxide produced against time (minutes)
( 3 mks)
(c) What volume of carbon (IV) oxide were evolved during the 20th minutes intervals (20- 40) minutes ( 1 mk)
(d) Why was there no increase in volume of the gas evolved after 100 minutes? ( 1 mk)
(e) Calculate the mass of 11. 2 cm3 of carbon (IV) oxide gas evolved at stp: molar gas volume = 22.4 dm3
(f) Determine the mass of calcium carbonate which had reacted after 120 minutes ( 1 mk)