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Experiment to measure the solubility of Calcium Hydroxide.

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Introduction

PRACTICAL: THE SOLUBILITY OF CALCIUM HYDROXIDE (Ye Yang) Experiment Times Initial Volume of 0.05M of HCL ( cm�) �0.1 Final Volume Of 0.05M HCL (cm3) �0.1 Added Volume Of 0.05M HCL (cm3) �0.1 Rough 0 �0.1 10.20 �0.1 10.20 �0.1 1 20.05 �0.1 29.38 �0.1 9.33 �0.1 2 30.08 �0.1 39.23 �0.1 9.25 �0.1 3 39.23 �0.1 48.53 �0.1 9.30 �0.1 Average Added Volume of 0.05M HCL (cm3) �0.1 : 9.26 �0.1 Temperature of Ca(OH02 solution is 22�c =273+22=295K Uncertainties Pipette �0.04cm3 %error= 0.04/10 x 100 = 0.4% Burette �0.1cm3 %error= 0.1/9.26 x 100 = 1.08% Total %error = 1.48% Calculation and procedures 1. Used Graduated Cylindar to measure 100cm3 of distilled water and placed it in a flask. 2. Added about spatula of solid calcium hydroxide. 3. Stoppered the flask and shook well for on minute. 4. ...read more.

Middle

Shook it slowly. When the colour from yellow became red. Turned off the tap, recorded the final volume of 0.05M HCL. This time is rough, for knowing the probable data and controling it well in next time. Rough time: Added volume of 0.05M HCL= Final volume of 0.05M HCL - Initial volume of 0.05M HCL= 10.20cm3 -0cm3=(10.20 �0.1)cm3 12. Calculated the data of adding volume of HCL in rough time. Recorded the initial volume of 0.05M HCL. Turned on the tap, made HCL solution fell into the flask. Shook it slowly. Looked the degree of burette, when it close the data in the rough time, made HCL solution fell into the flask drop by drop. When Ca(OH)2 solution changed from yellow to red. ...read more.

Conclusion

Conclusion The literature value for the solubility of calcium hydroxide is 1.53�10-3 mol per 100g water at 298K. V =100g/1000g�dm-3=0.1dm3 cCa(OH)2 =n�v=1.53�10-3/ 0.1dm3=0.0153(mol�dm-3 ) So, the standard concentration is 0.0153M at 298k. 0.01530 0.02281 0.02315 0.02349 Limitations Random errors: 1. The temperature is different. The standard data is gotten at 25�C, but I measured the temperature is 22�C. 2. Not easy to see the colour change, when I was seeing the degree of burette. So I can not turned off the tap immediately. Improvement For random error1: I can make this experiment at 25�C next time. For random error2: When I make this experiment next time, I can watch the colour change of Ca(OH)2, and my partner can watch the degree of burette. When the degree close the rough data, my partner can control the tap and make it fall down drop by drop. When the colour change, I will tell my partner to turn off the tap. ...read more.

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