Question 53
Look at the figure and answer the following questions.

(a) What change would you observe in the calcium Hydroxide solution taken in tube B?

(b) Write the reaction involved in test tube A and B respectively

(c) If Ethanol is given instead of Ethanoic acid, would you expect the same change?

(d) How can a solution of lime water be prepared in the laboratory?

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Solution

(a) It will turn milky.

(b) $2 C H_{3} C O O H + N a_{2} C O_{3} \to 2 C H_{3} C O O N a + H_{2} O + C O_{2}$
$C a (O H)_{2} + C O 2 \to C a C O_{3} + H_{2} O$
With excess $C O_{2}$ , milkiness disappears.
$C a C O_{3} + H_{2} O + C O_{2} \to C a (H C O_{3})_{2}$

(c) As $C_{2} H_{5} O H$ and $N a_{2} C O_{3}$ do not react, a similar change is not expected.
$C_{2} H_{5} O H + N a_{2} C O_{3} \to$ No change

(d) The lime water is prepared by dissolving calcium oxide in water and decanting the supernatant liquid.

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