Saturday
April 19, 2014

Homework Help: Chemistry

Posted by Dubs on Thursday, April 22, 2010 at 1:07am.

A few questions I don't really get and need to see the work for

A 50.0 mL sample of 0.55 M benzoic acid, C6H5COOH, a weak monoprotic acid, is titrated with 0.51 M NaOH. Calculate the pH at the equivalence point. Ka of C6H5COOH = 6.5 multiplied by 10-5.

What is the pH of a solution resulting from the addition of 18.0 mL of 0.15 M HCl to 50.0 mL of 0.12 M NH3? Assume the volumes are additive. Kb of NH3 = 1.8 multiplied by 10-5.

What ratio [CH3NH3+]/[CH3NH2] is needed to prepare a buffer solution with a pH of 8.20 from methylamine, CH3NH2, and methylammonium chloride, CH3NH3Cl? Kb of CH3NH2 = 3.7 multiplied by 10-4.

What is the pH of a solution resulting from the addition of 18.0 mL of 0.15 M HCl to 50.0 mL of 0.12 M NH3? Assume the volumes are additive. Kb of NH3 = 1.8 multiplied by 10-5.

What is the molarity of a methylamine solution, CH3NH2(aq), that has the same pH as 0.0773 M NH3(aq)?

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