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Question
A metal 'M' on reacting with dilute acid liberates a gas 'G'. The same metal also liberates gas 'G' when reacts with a base.
- Write the name of gas 'G'.
- How will you test the presence of this gas?
- Write chemical equations for the reactions of the metal with (1) an acid and (2) a base.
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Solution
- The gas G is hydrogen gas.
- Bring a burning candle close to the hydrogen source to perform a typical test for hydrogen (H2) gas. Hydrogen gas then burns with a squeaky pop sound. The 'pop' that hydrogen gas makes when it burns can be used to identify it. The 'pop' sounds like a tiny explosion.
- Zinc metal reacts with both acid and base to produce hydrogen gas.
\[\ce{\underset{Zinc}{Zn(s)} + \underset{hydroxide}{\underset{sodium}{2NaOH(aq)}} ->[Heat]\underset{zincate}{\underset{sodium}{Na2ZnO2(aq)}} + \underset{Hydrogen}{H2(g)}\uparrow}\]
\[\ce{Zn(s) + \underset{(dil{.})}{\underset{Hydrochloric acid }{2HCl(aq)}}->\underset{Zinc chloride}{ZnCl2(aq)} + H2(g)\uparrow}\]
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\[\begin{array}{cc}
\phantom{}\ce{\underset{}{CH3COOH + PCl5} ->[][ ] \underset{}{A}->[C6H6][anhy.AlCl3 ] \underset{}{B}->[C2H5MgBr][Ether] \underset{}{C}}\\
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Product C would be:
