Titration of Calcium hydroxide with hydrochloric acid Sample 1 Mass of Erlenmeye

Question

Titration of Calcium hydroxide with hydrochloric acid

Sample 1

Mass of Erlenmeyer Flask

22.19 g

Mass of Erlenmeyer Flask & Calcium Hydroxide Solution (lime water)

25.15 g

Mass of Calcium Hydroxide Solution

2.96 g

Volume of Ca(OH)2 Density=1,000 g/mL

Concentration of HCl (M)

.1 M

Initial HCl volume in syringe

1 mL

Final HCl volume in syringe

.49 mL

Volume of HCl Delivered

Moles of HCl Delivered

Moles of OH- in Sample

Moles of Ca2+ in Sample

Molar Solubility (M)

Calculated Ksp

Please show work.

Sample 1

Mass of Erlenmeyer Flask

22.19 g

Mass of Erlenmeyer Flask & Calcium Hydroxide Solution (lime water)

25.15 g

Mass of Calcium Hydroxide Solution

2.96 g

Volume of Ca(OH)2 Density=1,000 g/mL

Concentration of HCl (M)

.1 M

Initial HCl volume in syringe

1 mL

Final HCl volume in syringe

.49 mL

Volume of HCl Delivered

Moles of HCl Delivered

Moles of OH- in Sample

Moles of Ca2+ in Sample

Molar Solubility (M)

Calculated Ksp

Explanation / Answer

The volume of Ca(OH)2 = 2.96 mL

The volume of HCl delivered = 1 - 0.49 = 0.51 mL

The no. of moles of HCl delivered = 0.1 mol/L * 0.51*10-3 L = 5.1*10-5 mol

The no. of moles of OH- in sample = no. of moles of HCl = 5.1*10-5 mol

The no. of moles of Ca2+ in sample = 1/2 * no. of moles of Ca(OH)2 = 2.55*10-5 mol

The molar solubility of Ca(OH)2 = 2.55*10-5 mol / 2.56*10-3 L ~ 10-2 M

Calculated Ksp = [Ca2+][OH-]2 = (10-2)*(2*10-2)2 = 4*10-6

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