2. In this experiment, you will titrate (neutralize) calcium hydroxide with hydr

Question

2. In this experiment, you will titrate (neutralize) calcium hydroxide with hydrochloric acid. Below is the unbalanced equation for this reaction. Fill int the best balanced equation (note: if a coefficient should be 1, you can leave it blank). blks to give Ca(OH)2(aq) + 2 HCl(aq) CaCl2(aq) + 2 H2O(I) ou are correct. ceipt no, is 163-314 Previous Tries 3. A 25.00 mL sample of a saturated Ca(OH)2 solution required 26.81 mL of 0.0200 M HCI to titrate it. a. Using this data, calculate the molar solubity of Ca(OH)2 mol/L Sutril Arsr Tries 0/99 b. Calculate the Ca(OH)2 solubility in grams per liter. 9/L Sutril Arsr Tries 0/99 c. Calculate the Ksp value for Ca(OH)2 using this date Submit Answer Tries 0/99 d. Calculate the pKsp value for Ca(OH)2(s) using this data Sutmit Ansiwer Tries 0/99

Explanation / Answer

a)

mol of HCl = MV = (0.02*26.81*10^-3) = 0.0005362

mol of Ca(OH)2 = 1/2*mol of Hcl = 0.0005362/2 = 0.0002681

[Ca(OH)2] = mol/V = (0.0002681)/(25*10^-3) = 0.010724M

S = 0.010724 mol per liter

b)

in mass:

mass solubility = mol*MW = 0.010724*74.0927 = 0.7945 g of Ca(OH)2 / L

c)

Ksp = [Ca+2][OH-]^2

Ksp = (S)(2*S)^2

4*S^3 = Ksp

4(0.010724 ^3) = Ksp

Ksp = 0.000004933 = 4.93*10^-6

d)

pKsp = -log(Ksp) = -log(4.93*10^-6) = 5.31

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