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An aqueous solution is 0.8624 molal in sodium thiosulfate. It has a freezing point of -3.064 °C. Determine the effective number of particles arising from each Na2S2O3 formula unit in this solution. For water, Kfp = 1.86 °C/m.

Question

An aqueous solution is 0.8624 molal in sodium thiosulfate. It has a freezing point of -3.064 °C. Determine the effective number of particles arising from each Na2S2O3 formula unit in this solution. For water, Kfp = 1.86 °C/m.

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Step 1

Freezing point is a colligative property meaning it depends upon the amount of solute or ions present in solution.

 

Step 2

Given here,

an aqueous solution is (m) = 0.8624 molal in sodium thiosulfate

It has a freezing point of = -3.064 °C

Freezing point of water = 0 °C

Depression in freezing point (dTf) = -3.064 - 0 = -3.064 °C

i = Van't Hoff Factor (number of particles arising from each Na2S2O3 ...

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