Given below are two statements : One is labelled as Assertion A and the other labelled as reason R
Assertion A : During the boiling of water having temporary hardness, Mg(HCO3)2 is converted to MgCO3.
Reason R : The solubility product of Mg(OH)2 is greater than that of MgCO3.
In the light of the above statements, choose the most appropriate answer from the options given below :
Solution
<b>A</b> : For temporary hardness,<br> Mg(HCO<sub>3</sub>)<sub>2</sub> $\buildrel {heating} \over
\longrightarrow$ Mg(OH)<sub>2</sub> + 2CO<sub>2</sub> Assertion is false. MgCO<sub>3</sub> has
high solubility product than Mg(OH)<sub>2</sub>.<br><br>
<b>R</b> : MgCO<sub>3</sub> is more water soluble than Mg(OH)<sub>2</sub>. <br><br>
K<sub>SP(Mg(OH)<sub>2</sub>)</sub> = 1.8 × 10<sup>–11</sup><br><br>
K<sub>SP(MgCO<sub>3</sub>)</sub> = 3.5 × 10<sup>–8</sup>
About this question
Subject: Chemistry · Chapter: Equilibrium · Topic: Chemical Equilibrium and Kc, Kp
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