Explain what specific error in calculating your Ksp value would occur( Ksp being

Question

Explain what specific error in calculating your Ksp value would occur( Ksp being too high or too low), compared to the situation in which no errors occur. Remember that the student doesn't know these errors occurred. When you answer the questions, consider how the situatio naffects the calculation of Ksp.

1) the buret was not condition( it still had water in it) when you add HCl.

2) there was Ca(OH)2 solid (that was not filitered off) in your solution to be titrated.

3) You measured 24.00 mL of Ca(OH)2 instead of 25.00 mL.

4) The HCl concentration was actually lower than the reported molarity on the bottle.

Thank you so much!

Explanation / Answer

Effect on Ksp value calculated,

1) the buret was not conditioned that is it still had water in it. This would dilute HCl in the buret and the concentration would be lower than the actual value. The Ksp thus calculated would be higher than the actual value. It would be too high.

2) If not all the solid Ca(OH)2 dissolved and removed from the filtrate, the amount of HCl used would be high. This would result in a Ksp value too high from the actual value.

3) If the measured Ca(OH)4 solution was lower than the actual value, the Ksp value would be too low and the amount of Ca2+ estimated would be low.

4) If the HCl concentration was actually lower then the reported molarity. We would use more HCl for the reaction. Estimated Ca2+ would be higher, and thus Ksp would also be too high.

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