(Except where otherwise noted, 2 pts. for all blanks, boxes and questions) Give

Question

(Except where otherwise noted, 2 pts. for all blanks, boxes and questions) Give the balanced equation for the solvation of Ca(OH)2 in water Write the solubility-product expression, Kp, for Ca(OH)2 Explain in complete sentences using equations if necessary for illustration. 1. What is the stoichiometric relationship of the hydroxide ion concentration to calci um ion concentration? 2. What is the stoichiometric relationship of the solubility of Ca(OH): to the concentration of OH in solution? 3. What is the stoichiometric relationship of the solubility of CatOH)2 to the concentration of Ca" in solution? Using LeChatlier's Principle what is the predicted effect of the addition of the common ion, Ca, on the solubility of Ca(OH2? 4. 5. What is the expected effect of the addition of the common ion on K.p? 6. Write the balanced equation for the neutralization of calcium hydroxide by hydrochloric acid

Explanation / Answer

a)

balanced equation :

Ca(OH)2 (s) ---------------------->Ca+2 (aq) + 2OH- (aq)

b)

Ksp expression:

Ksp = [Ca+2][OH-]^2

1)

stoichiometric relation = hydroxide ion : calcium ion = 2:1

2)

stoichiometric relation = Ca(OH)2 : OH- = 1 : 2

3)

stoichiometric relation =Ca(OH)2 : Ca+2 = 1 :1

4)

the solubility of Ca(OH)2 will decreases due to common ion Ca+2

Ca(OH)2 <---------------------> Ca+2 + 2OH-

on addition of Ca+2 product concentration increases the reaction shifts to backward direction

5)

due to common ion Ksp value decreases due to decreases in the concentration of ions

6)

Ca(OH)2 + 2HCl -----------------> CaCl2 + 2H2O

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