A determination of the molar solubility and the K_sp calcium hydroxide was compl

Question

A determination of the molar solubility and the K_sp calcium hydroxide was completed according to the experimental procedure. The following data were collected for Trial I. (See Report Sheet.) Complete the table for the determinations. Record the calculated values to the correct number of significant figures. Molar Solubility and Solubility Product of Calcium Hydroxide Calculation Volume of saturated Ca(OH)_2 solution (mL) 25.00 Molar concentration of standard HCI solution (mol/L) 0, 0180- Buret reading, initial (ml.) 1.70 Buret reading, final (mb) 13.90 Volume of HCI added (mL) Moles of HCI added (mol) Show calculation Moles of OH in saturated solution (mol) Show calculation [OH 1. equilibrium (mol/L) Show calculation [Ca:^2+. equilibrium (mol/L) Show calculation. Molar solubility of Ca(OH)_2 (mol/L) Show calculation Show calculation. For Trials 2 and 3, the K_sp of Ca(OH)_2 was 5.2 times 10^-6 and 4.8 times 10^-6 respectively.

Explanation / Answer

Calculations,

5. Volume of HCl added = 13.9 - 1.70 = 12.2 ml

6. moles of HCl = 0.048 M x 12.2 ml = 0.5856 mmol

7. moles of OH- = 0.5856 mmol

8. [OH- ] at equilibrium = 0.5856/25 = 0.0234 mol/L

9. [Ca2+] at equilibrium = 0.5856/2 x 25 = 0.0117 mol/L

10. molar solubility of Ca(OH)2 = 0.0117 mol/L

11. Ksp for Ca(OH)2 = (0.0117)(0.0234)^2 = 6.42 x 10^-6

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