A tree is 10 m tall. If the sap rises due to osmotic pressure at 20 degree C, wh

Question

A tree is 10 m tall. If the sap rises due to osmotic pressure at 20 degree C, what must be the total molarity of the solutes in the sap? Assume the groundwater is pure water with a density of 1.0 g/mL and that 1 mmHg = 13.6 mmH_2O. The simplest way to figure out the van't Hof factor, i, is the count the ions that a species dissociates into. The dissociation, however, is affected by the concentration of solutions with more concentrated solutions having lower amounts of dissociation. Calculate the van't Hoff factor for a 2.00% (w/w) H_2SO_4 solution that freezes at -0.796 degree C. How does this help us decide whether a sulfuric acid solution is made up of mostly H_2SO_4, of mostly HSO_4^- and H_3O, or of mostly 2 H_3O^+ and SO_4^2-? Determine the molarity, molality, mole fraction, mass fraction, boiling point, freezing point, and vapor pressure at 25 degree C where the vapor pressure of pure water is 23.756 torr) of a 0.16% (w/w) solution of potassium sulfate.

Explanation / Answer

1)

P = M*R*T

M = P/(RT)

P = Patm + Pcolumn = 101325 + rho*g*h = 101325 + 1000*9.8*10 = 199325 PA = 199325/101325 = 1.9671 atm

so

M = 1.9671/(0.082*293)

M = 0.0818738 mol per liter

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