In our lab experiment, we filtered CaCl and CaOH2 solutions that we prepared the

Question

In our lab experiment, we filtered CaCl and CaOH2 solutions that we prepared the previous week and transferred both of the filtrates using a 25 ml pipette into two erlenmeyer flasks. We then prepared the standard HCl by pipeting 100 ml of HCl to prepare 250 ml of 0.04M HCl from the 0.1 M HCl solution that we initially had. We pipeted 100 ml of HCl into a 250 ml volumetric flask and diluted to the mark. The buret was filled with the prepared HCl and both the CaCl and CaOH2 were titrated until a yellow endpoint was reached, this titration was repeated three times for each solution.

The result for Ksp of CaCl2=6.881 * 10^-6

Ksp for CaOH2= 7.11 * 10^-6

Q. Do you expect the twi Ksp values to be consistent or inconsistent? Explain why.

Explanation / Answer

The above shown experiment would give inconsistent results for the Ksp values,

The solutions were preppared and not used immediately for the experiment which would have changed the concentration due to dilution effect with moisture in air.

Thus the results would be different from the ones expeected with fresh solutions.

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