Which of the following methods is NOT suitable for concentrating a protein solution?
Simple distillation
Ultrafiltration
Lyophilization
Dialysis against a concentrated polymer solution
Related Questions
If 20 g of solute is dissolved in 80 g of solvent, what is the mass percentage of the solute?
20%
80%
25%
40%
Which of these is the correct formula for calculating molality?
Moles of solute / Liters of solution
Moles of solute / Kilograms of solvent
Grams of solute / Liters of solution
Grams of solute / Kilograms of solvent
Molality is defined as the number of moles of solute per:
Liter of solution
Kilogram of solvent
Kilogram of solution
Liter of solvent
What is the unit of molarity?
mol/kg
mol/L
g/L
g/mol
A solution is prepared by dissolving 2.5g of a non-volatile solute in 100g of water. The vapor pressure of the solution is found to be 22.87 Torr at . If the vapor pressure of pure water is 23.76 Torr at the same temperature, what is the molar mass of the solute (in g/mol)?
60
120
30
90
A 0.5 molal aqueous solution of urea () is prepared. What is the mole fraction of urea?
0.0089
0.0090
0.50
0.99
A solution is prepared by dissolving 10 g of glucose in 190 g of water. What is the mass percentage of glucose in the solution?
5%
10%
2%
95%
Which concentration term is independent of temperature?
Molarity
Molality
Normality
Formality
What is the molarity of a solution containing 1 mole of solute in 500 mL of solution?
0.5 M
1 M
2 M
4 M
