Chemical Forums

Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: VoiceofGoat on November 04, 2015, 01:51:17 PM

Title: Back Titration Problem
Post by: VoiceofGoat on November 04, 2015, 01:51:17 PM

A 50.00 mL beverage sample is treated with 20.00 mL of 0.01439 M NaOH to neutralize all of the acid in the sample. The resulting solution is then back titrated with 0.0047 M HCl to the phenolphthalein endpoint. It requires 21.73 mL to reach the endpoint. Calculate the % (w/v) of acid in the sample assuming that all of it comes from citric acid.

Not sure how to do this one, any help is appreciated.

Title: Re: Back Titration Problem
Post by: Borek on November 04, 2015, 05:59:19 PM

You really should at least try, this is quite simple.

How much base was used? How much HCl was added? How much base reacted with the acid present in the beverage?

Title: Re: Back Titration Problem
Post by: VoiceofGoat on November 04, 2015, 09:05:16 PM

Never mind. Somehow managed to miraculously figure it out.