....Ca(OH)2(s) ==> Ca^2+(aq) + 2OH^-(aq)
I...solid...........0...........0
C...-x..............x..........2x
E..solid-x..........x..........2x
Substitute the E line (ignore the solid-x since we don't include solids in Ksp) into Ksp expression and solve for x = solubility Ca(OH)2 in mols/L = M.
Then convert M to mols (mols = M x L) and convert to grams (g = mols x molar mass). That will be g necessry to prepare 365 mL of a saturated Ca(OH)2 solution.
Calcium hydroxide has Ksp = 5.5 x 10-5 at 25 oC and a molar mass of 74.10 g/mol.
How many grams of calcium hydroxide are needed to create 365 mL of a saturated solution of calcium hydroxide at 25 oC?
1 answer