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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: zerobladex on December 16, 2008, 07:35:40 PM

Title: Calculating Ksp of Calcium Hydroxide
Post by: zerobladex on December 16, 2008, 07:35:40 PM
I'm calculating the Ksp of calcium hydroxide for a lab using two different methods:
Titrations and using an electronic pH meter

I just had a few questions I was hooping someone could answer.

How does the reaction of between calcium hydroxide and carbon dioxide, which forms calcium carbonate increase the percentage error in the lab?
Title: Re: Calculating Ksp of Calcium Hydroxide
Post by: nj_bartel on December 16, 2008, 10:44:30 PM
Are you sure you don't mean carbonic acid?  Carbonic acid forms when CO2 reacts with water.
Title: Re: Calculating Ksp of Calcium Hydroxide
Post by: Rabn on December 17, 2008, 12:14:54 AM
Have you written out your system of equations?
Title: Re: Calculating Ksp of Calcium Hydroxide
Post by: Borek on December 17, 2008, 03:36:26 AM
Quote from: nj_bartel on December 16, 2008, 10:44:30 PM
Are you sure you don't mean carbonic acid?  Carbonic acid forms when CO2 reacts with water.

No matter how you will treat the mechansim, final effect (in terms of equivalents of CO2 reacting with Ca(OH)2) will be exactly the same.
Title: Re: Calculating Ksp of Calcium Hydroxide
Post by: nj_bartel on December 17, 2008, 12:22:56 PM
Oh, that makes sense.  Guess it was just easier for me to see it in terms of acid/base.