Calculate the freezing point depression for a solution containing 456g calcium phosphate in 3280g water. 4.185

Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Calculate the freezing point depression for a solution containing 456g calcium phosphate in 3280g water. 4.185

Expert Solution
Step 1

Given:

Mass of Ca3(PO4)2 = 456 g

Molar mass of Ca3(PO4)2 = 310.18 g/mol

Mass of H2O = 3280 g = 3.28 Kg

Freezing point of water = 0 oC

Molal depression constant = Kf = 1.86 °C/m

Ca3(PO4)2 dissociates into 3 Ca+ and 2 PO4- ions. So, there are total 5 ions in the solution. therefore, van 't Hoff factor(i) = 5.

Step 2

Calculation for moles of Ca3(PO4)2:

Chemistry homework question answer, step 2, image 1

Step 3

Calculation for molality of solution:

Chemistry homework question answer, step 3, image 1

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