why is laboratory method of collecting hydrogen preferred over industrial method
Answers
The laboratory preparation of hydrogen gas usually involves the action of dilute sulphuric acid or dilute hydrochloric acid on zinc granules. Granulated zinc is ideal for the preparation of hydrogen gas in chemical laboratories because it usually contains a small amount of copper, which has the ability to act as a catalyst to the associated chemical reaction and, therefore, increase the rate of the chemical reaction without actually participating in it. An experimental procedure for the laboratory preparation of hydrogen gas is provided below.
Answer:
In the laboratory, dihydrogen gas is prepared by taking zinc granules in a 500 ml flask.
To this, dilute HCl or dilute sulphuric acid is added through a thistle funnel.
Dihydrogen gas is released and the gas is collected by the downward displacement of water because it is a gas lighter than water
Reaction:
Zn
(s)
+2HCl
(aq)
→ZnCl
2(aq)
+H
2(g)
Zn
(s)
+H
2
SO
4(aq)
→ZnSO
4(aq)
+H
2(g)
.
