Look at the figure and answer the following questions:
$(a)$ If ethanol is used instead of ethanoic acid,would you expect the same change?
$(b)$ How can a solution of lime water be prepared in the laboratory?

(N/A) As $C_2H_5OH$ (ethanol) and $Na_2CO_3$ (sodium carbonate) do not react with each other,a similar change (effervescence due to $CO_2$ evolution) is not expected.
$C_2H_5OH + Na_2CO_3 \rightarrow$ No reaction
$(b)$ Lime water (calcium hydroxide solution) is prepared in the laboratory by dissolving a small amount of calcium oxide $(CaO)$ in water. The mixture is stirred and then allowed to settle. The clear supernatant liquid is then decanted or filtered to obtain the lime water solution.