Question

K_sp of Ca(IO₃)₂ lab questions

1) Why is it necessary to filter the calcium iodate solution through dry filter paper, without adding any water?

2) If water had been added during the filtration process, how would this affect your calculated value for the K_sp of calcium iodate? Clearly explain whether your value would be too high or too low compared to the actual K_sp and why.

Answer 1

1. It is necessary to filter the calciuk iodate solition through a dry filter paper without adding any water. This is because the molarity of IO₃^- ​​​​​​ ions may change. _​​​​​

2. If water is added during the filtration process the saturation of solution may change. The solution may not be completely saturated which means the concentration of ions are not maximum. Therefore K_sp will be lower as the IO₃^- ion concentration is less.