Question

Calculate the osmotic pressure of the following solutions:

a) 20 g/L of NaCl in water at temperature 25oC

b) Water at temperature 40oC with calcium carbonate concentration
of 30,000 ppm

Answer #1

Calculate the osmotic pressure of the following solutions at
25oC. i) Solution of 0.5mol NaCl/kg H2O ii) Solution of 1.0g
sucrose/kg H2O iii) Solution of 1.0g MgCl2/kg H2O Molecular weight:
Sucrose = 342.3g/mol; MgCl2 = 95.23g/mol The density of H2O at 25oC
is 997kg/m3

a) Calculate osmotic pressure for 6000 mg/L NaCl at 25 deg C
with osmotic co-efficient of 0.98
b) The feed of a UF membrane is seeded with MS-2 bacteriophage
virus. On sampling we find 110 colony forming units (cfu)/mL in the
feed and 70 cfu/mL in the permeate. Calculate rejection and log
removal.

The osmotic pressure of a 6.613 g dm-3 solution of polystyrene
in toluene was measured at 25oC, and the pressure, expressed in
terms of the height of the solvent, was 1.910 cm. The density of
toluene at this temperature is 1.004 g cm3. Calculate the molar
mass of the polymer Using PI=[B]RT
Where [B]= nb/V as the molar concentration of the solution.

Which of the following solutions would have the highest value
for osmotic pressure? (Assume each solution has water as the
solvent and are at the same temperature.) A. 0.20 M NaCl B. 0.10 M
CaCl2 C. 0.50 M CH3OH D. 0.30 M CaCl2 E. 0.10 M CH3COCH3

Calculate the osmotic pressure of each of the following
solutions at 290.0 K .
Part A
A 565.0 mL solution containing 85.0 g of glucose, C6H12O6 .
Part B
A 565.0 mL solution containing 125.0 g of magnesium sulfate,
MgSO4 . (i = 1.3)

What is the strength (in ppm) of 0.500 g NaCl dissolved in 1.06
L of water (Density = 1.000 kg/L). Answer in both % and ppm
(mg/L).

A) In reverse osmosis, water flows out of a salt solution until
the osmotic pressure of the solution equals the applied pressure.
If a pressure of 66.0 bar is applied to seawater, what will be the
final concentration of the seawater at 20 °C when reverse osmosis
stops?
B) Assuming that seawater has a total ion concentration (a.k.a
colligative molarity) of 1.10 Mc, calculate how many liters of
seawater are needed to produce 86.2 L of fresh water at 20...

An aqueous solution containing a substance whose concentration
is 7.50 g/L has an osmotic pressure of 1150 Torr at 77 K.
(a) What is the molecular weight of the solute?
(b) What is the osmotic pressure of a solution at 27 degrees C
that contains 1.00 g of this solute in 500 mL of solution?

Calculate the osmotic pressure of each of the following aqueous
solutions at 20C. a. 24.5 mL of glycerol in 250 mL of aqueous
solution (density of glycerol is 1.265g/mL) b. 22.5g of CaCl2 in
350 mL of solution.

Using the equation for osmotic pressure as a guide,
theoretically rank the solutions from best to worst in terms of
ability to hydrate chickpeas.
1 M NaCl
Pure Water
2M KCl
1 M Na2SO4
1 M KCl

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