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56 solutions

Freezing Point Depression

Q. A solution was made by adding 800 g of ethanol C2H5OH to 8.0x10^3 g of water. How much would this lower the freezing point

Solved • Dec 13, 2019

Freezing Point Depression

Q. A 2.50 g sample of napththalene, C10H8, was dissolved in 100 g of benzene. What is the freezing point of the benzene solution? The freezing point of pure bezene is 5.45°C; Kf = 5.07°Cm^-1

Solved • Dec 13, 2019

Freezing Point Depression

Q. The freezing point of a 0.204 molal solution of ethylene glycol is depressed by 1.96oC. What is the freezing point constant for ethylene glycol?

Solved • Dec 4, 2019

Freezing Point Depression

Q. Two pure solid substances, A and B, each melt at 87.5 °C. An unknown pure solid substance X also melts at 87.5 °C. Melting points are obtained for mixtures of X with A, X with B, and A with B. The melting point of each mixture tested is found to be below 87.5 °C. What conclusion is justified by these data?

Solved • Dec 4, 2019

Freezing Point Depression

Q. The freezing point of pure ethanol is -114.6 degree Celsius at 1 atm. The molal freezing point depression constant (Kf) for ethanol is 1.99 degree C/m. What is the freezing point (degree Celsius) of the solution prepared by dissolving 7.00 g of glycerin, C3H8O3 in 291 g ethanol, C2H5OH ( MM= 46.1 g/ mol)

Solved • Nov 23, 2019

Freezing Point Depression

Q. A student swiped a bottle of lead (II) nitrate (molar mass = 331.2 g/mol) from the chemical stockroom as a salt substitute to clear out the ice around the school. If it is -2.00 degree Celsius outside, how many grams of lead (II) nitate would you need to melt 2.00 kg of ice ? Kf = 1.86 degree C/m Kb= 0.512 degree C/m.

Solved • Nov 23, 2019

Freezing Point Depression

Q. Calculate the freezing point of a solution made by dissolving 85.0 g of glucose (C6H12O6) a nonvolatile, non electrolytes solute in 340. g of water? (Kf = 1.86 degree C/m)

Solved • Nov 23, 2019