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1)The basicity constant of ammonia is K= 1.8&10^-5. What is the molar concentration of ammonia if the concentration of OH- ions is 1.5*10^-3?

2)The solubility of Mg(OH)2, Ksp = 8.9 * 10^-12, in 1 L of a solution buffered (with large capacity)at pH 12 is?

3)48.61 g of magnesium was dissolved in diluted sulfuric acid and 490 g of MgSO4 . 7H2O was isolated from the solution. How many percent of impurities (if any) did the metal contain?

4)A 0.12 M solution of a weak base is 1 % dissociated. Calculate Kb.

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