A cloth strip dipped in onion juice is used for testing a liquid ‘X’. The liquid ‘X’ changes its odour. Which type of an indicator is onion juice? The liquid ‘X’ turns blue litmus red. List the observations the liquid ‘X’ will show on reacting with the following :(a) Zinc granules(b) Solid sodium carbonateWrite the chemical equations for the reactions involved.
Onion juice is an olfactory indicator.
As liquid X turns blue litmus red. Hence, it is a acid.
(a) Zinc granules: Zinc granules react with acids like HCl to produce corresponding salt of Zinc and Hydrogen gas.
When a burnt match stick is brought close to the mouth of the test tube, the
gas burns with a pop sound.
$Zn + Acid \rightarrow Zn \ salt + H_2$
$Zn + HCl \rightarrow ZnCl_2 + H_2$
(b) Solid sodium carbonate: Solid sodium carbonate react with acids like HCl to produce corresponding salt of Sodium, water and carbon dioxide. The gas CO2 released turns lime water milky.
$Na_2CO_3 + Acid \rightarrow Na \ salt + H_2O + CO_2$
$Na_2CO_3 + 2HCl \rightarrow 2NaCl + H_2O + CO_2$
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