S.6 CHEM QUESTION (HELP!)

1.
http://chemistry.uah.edu/CourseWare/ch123/resources/ch123solubilityconstants.html
Ksp of Ca(OH)2 = 7.9 x 10-6 (mol dm-3)3

http://www.ktf-split.hr/periodni/en/abc/kpt.html
and http://www.solubilityofthings.com/water/ions_solubility/ksp_chart.php
Ksp of Ca(OH)2 = 5.02 x 10-6 (mol dm-3)3

http://www.csudh.edu/oliver/chemdata/data-ksp.htm
Ksp of Ca(OH)2 = 5.5 x 10-6 (mol dm-3)3


2.
Small amounts of chemicals and small scale of apparatus are used in microscale experiments. Therefore,
• the cost of each experiment is lowered.
• the time spent for each experiment is shortened.
• the experiments become less dangerous.
• a series of experiments can be performed at the same time.
• each student can perform the experiment instead of group experiment.
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