Activity 1.34
Take a few zinc granules in a conical flask or a test tube.
Add dilute hydrochloric acid or sulphuric acid to this
(Fig. 1.2).
CAUTION: Handle the acid with care.
Do you observe anything happening around the zinc
granules?
* Touch the conical flask or test tube. Is there any change in
its temperature?
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Answer:
When zinc granules are added to sulphuric acid , there occurs a change in the state of zinc granules and they are converted to zinc sulphate (ZnSO4) and hydrogen gas is evolved.
Zn + H2SO4 -> ZnSO4 + H2
This reaction is exothermic, i.e. it involves release of heat and so the flask becomes hot and temperature of the system increases.
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