Answer:
Carbon dioxide \[(C{{O}_{2}})\]
slightly acidic in nature, therefore it reacts with the wrong base KOH to form\[{{K}_{2}}C{{O}_{3}}\].
\[2KOH+C{{O}_{2}}(g)\to
{{K}_{2}}C{{O}_{3}}+{{H}_{2}}O\]
Increase in the weight of potash bulbs will give the weight
of \[C{{O}_{2}}\] evolved.
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