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Magnesium hydroxide is slightly soluble in water (Ksp = 1.8 x 10-11). NaOH is added to a solution of Mg(NO3)2 until a precipitate forms and persists. The solution is then heated and the precipitate dissolves. What can you conclude from these observations?

A. dissolution of Mg(NO3)2 is endothermic
B.dissolution of Mg(NO3)2 is exothermic
C. dissolution of Mg(OH)2 is endothermic
D. dissolution of Mg(OH)2 is exothermic

Respuesta :

Answer:

Explanation:

When NaOH is added to a solution of Mg(NO3)2 , a precipitate forms which will be Mg(OH)2 . When temperature of the solution is raised , Mg(OH)2 gets dissolved.

According to Le Chatelier principle , reaction tends to proceed towards the balance point when , the effect of external change in temperature or pressure etc is reduced.

Addition of heat , promotes dissolution. It is possible only when  the process of dissolution is endothermic. Additional dissolution on heating helps in reducing the temperature because , process of dissolution is endothermic.

Dissolution of Mg(OH)₂ is endothermic.

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