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April 20, 2014

Homework Help: Chem 12

Posted by Kevin on Tuesday, March 27, 2007 at 12:21am.

Okay, this is a two-part question and the unit is acids and bases.

Ka for NH4 is 5.6 x 10^ -10
Kb for NH3 is 1.8 x 10^ -5

1. Determine the pH of a solution prepared by adding 0.0500 mole of solid ammonium chloride to 100mL of a 0.150 molar solution of ammonia.

2. If 0.0800 mole of solid magnesium chloride, MgCl2 is dissolved in the solution prepared in part (1) and the resulting solution is well-stirred, will a precipitate of Mg(OH)2 form? Show calculation to support your answer. (Assume the volume of the solution is unchanged. The solubility product constant for Mg(OH)2 is 1.5 x 10^ -11)

You have not asked a question.

1.
Use the Henderson-Hasslebalch equation to calcualte the pH of the solution.

2. From question 1, calculate (OH^-), then use that and (Mg^2+) to determine if (Mg^2+)(OH^-)^2 exceeds Ksp.

Post work if you get stuck.

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