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August 30, 2014

Homework Help: chemistry

Posted by Jessica on Tuesday, April 1, 2008 at 3:23pm.

Hi Cna someone please tell me what I must out into the Trial 1 column? It would be greatly appreciated.


theLab: Determining the Ksp For Ca(OH)2

Purpose: The purpose of this experiment is to determine the Ksp for calcium hydroxide.

Experimental Design: A saturated solution of calcium hydroxide is titrated with a hydrochloric acid solution of known concentration to a bromophenol blue endpoint (yellow).

Materials:

50.0 mL of 0.10 M HCl(aq)
bromophenol blue indicator
50.0 mLsaturated calcium hydroxide
50.0 mL buret
125 mL Erlenmeyer flask
50.0 mL of distilled water
10 mL pipet with pump
waste beaker

Procedure:

1.Fill the buret with the acid solution.
2.Pipet 10.0 mL of calcium hydroxide into the flask.
3.Add approximately 10.0 mL of water to the flask.
4.Add 4 drops of bromophenol blue to the flask.
5.Titrate the base to an endpoint and record the volume of acid added.
6.Dispose of the flask contents into a waste beaker.
7.Repeat steps 2-6 four more times.

Analysis:

1.Present your data in a table. Use the following table as a guide:

Trial 1 Trial 2
Initial volume of HCl(mL)
Final volume of HCl(mL)
Volume of HCl added(mL)

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