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We did an experiment and I don't really know how to calculate this question. If you could show me how to do one, then I could do the rest.

INFORMATION:
HCl = 0.1404 M
We placed 0.5 g Ca(OH)2 in 100 mL of the following solutions:
Flask A: Distilled Water (8.5 mL of HCl needed to titrate)
Flask B: 0.05 NaOH (12.7 mL of HCl needed to titrate)
Flask C: 0.025 NaOH (9.2 mL of HCl needed to titrate)
Flask D: 0.0125 NaOH (8.5 mL of HCl needed to titrate)

QUESTION is to calculate the following for each flask:
[OH-] from titration
[OH-] from solvent
[OH-] from Ca(OH2)
[Ca2+] from Ca(OH)2
Ksp = [Ca2+] * [OH-]

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