As the concentration of a solute in a solution increases, the treezing point ot

Question

As the concentration of a solute in a solution increases, the treezing point ot the solution and the vapor pressure of the solution and the vapor pressure of the solution increases, increases increases, decreases decreases, increases decreases, decreases A solution is prepared by dissolving calcium bromide in water and diluting to 500.0 ml_. It this solution contains 55 ppm calcium ions, the concentration of bromide ions is ppm. 55 110 220 500 none of the above Calculate the freezing point of a solution containing 5.0 grams ot potassium chloride and 550.0 of water. The molal-freezing-point-depression constant (K_f) for water is.86 degree C/m. -0.45 degree C +0.45 degree C -0.23 degree C +0.23 degree C 123 degree C

Explanation / Answer

Calcium bromide formula is CaBr2 so in solution:

CaBr2(s) ----------> Ca2+ + 2Br-

Which means that the solubility is:

CaBr2(s) ----------> Ca2+ + 2Br-

s 2s

[Br-] = 2*55 = 110 ppm Option B.

For the last question, there was a mistake in the data given because the constant Kf for water is 1.86 °C/m not 0.86. That's why the results would be wrong. If you use 1.86 instead of 0.86, you'll get -0.23 °C.

Hope this helps

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