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Calcium hydroxide, also known as slaked lime, is the cheapest strong base available and it is...

Calcium hydroxide, also known as slaked lime, is the cheapest strong base available and it is used in industrial processes win which low concentrations of base are required. Only 0.190 g of Ca(OH) 2 dissolves in 119 mL of water at 25 o C . What is the concentration of hydroxide ions in 165 mL of a solution containing the maximum amount of dissolved calcium hydroxide?

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Expert Solution

m = 0.19 Ca(OH)2

MW = 74.093

mol = 0.19/74.093 = 0.0025643

V = 119 ml = 0.119 L

M = mol/L = 0.0025643/0.119 = 0.02154

note that concnetration is independent of volume so

Ca(OH)2 = 0.02154 M

OH- ions are double that

0.02154*2 = 0.04308 M o f OH- ions

queen_honey_blossom answered 2 years ago
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