What is the pH of a solution prepared by dissolving 1.6 g of Ca(OH)2 in water to make 770. mL of solution?

Question

What is the pH of a solution prepared by dissolving 1.6 g of Ca(OH)2 in water to make 770. mL of solution?

Answer 1

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1.6 g Ca(OH)2 x 1 mol/74 g = 0.0216 moles

0.0216 moles / 0.770 L = 0.0281 M Ca(OH)2 = 0.0562 M OH- 

pOH = -log 0.0562 M = 1.25 

pH = 14 - pOH

pH = 12.75