Homework Help: Analy Chem

Posted by curtis on Wednesday, April 11, 2012 at 6:54pm.

Consider the titration of 100.0 mL of 0.110 M NaOH with 1.00 M HBr. Find the pH at the following volumes of acid added and make a graph of pH versus Va:Va = 0,2,5,8,10,10.1,11,11.1, and 12mL. Compute Ve, first.

Analy Chem - DrBob222, Wednesday, April 11, 2012 at 9:14pm
Find mols NaOH, subtract mols HBr.
If mols NaOH are greater then pOH = -log(OH^-) and convert to pH by
pH + pOH = pKw = 14.
If mols HBr are in excess, pH = -log(H^+).
Those three steps will do all of the points except for the equivalence point. That one is done by the hydrolysis of the salt, NaBr, which is 7 at the equivalence point.

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