Advertisements
Advertisements
Questions
Determine the osmotic pressure of a solution prepared by dissolving 25 mg of K2SO4 in 2 liter of water at 25°C, assuming that it is completely dissociated.
Determine the osmotic pressure of a solution prepared by dissolving 25 mg of K2SO4 in 2 liter of water at 25°C, assuming that it is completely dissociated. (mol. wt. of K2SO4 = 174 g mol−1)
Advertisements
Solution
Given: K2SO4 dissolved (w) = 25 mg = 0.025 g
Volume of solution (V) = 2 L
Temperature (T) = 25°C = (25 + 273) K = 298 K
R = 0.0821 L atm K−1 mol−1
When K2SO4 is dissolved in water, K+ and \[\ce{SO^{2-}4}\] ions are produced.
\[\ce{K2SO4 -> 2K+ + SO^{2-}4}\]
Total number of ions produced = 3
∴ i = 3
Molar mass of K2SO4 (M) = (2 × 39) + (1 × 32) + (4 × 16)
= 174 g mol−1
Applying the following relation,
π = `i n/V RT`
= `i xx w/M xx 1/V RT`
= `3 xx 0.025/174 xx 1/2 xx 0.0821 xx 298`
= 5.27 × 10−3 atm
RELATED QUESTIONS
What happens when the external pressure applied becomes more than the osmotic pressure of solution?
Blood cells are isotonic with 0.9% sodium chloride solution. What happens if we place blood cells in a solution containing
(i) 1.2% sodium chloride solution?
(ii) 0.4% sodium chloride solution?
Determine the amount of CaCl2 (i = 2.47) dissolved in 2.5 litre of water such that its osmotic pressure is 0.75 atm at 27°C.
Define osmotic pressure.
Calculate the mass of NaCl (molar mass = 58.5 g mol−1) to be dissolved in 37.2 g of water to lower the freezing point by 2°C, assuming that NaCl undergoes complete dissociation. (Kf for water = 1.86 K kg mol−1)
Choose the most correct option.
The osmotic pressure of blood is 7.65 atm at 310 K. An aqueous solution of glucose isotonic with blood has the percentage (by volume)________.
Answer the following in one or two sentences.
What is osmotic pressure?
Answer the following in one or two sentences.
A solution concentration is expressed in molarity and not in molality while considering osmotic pressure. Why?
Answer the following.
A solvent and its solution containing a nonvolatile solute are separated by a semipermeable membrane. Does the flow of solvent occur in both directions? Comment giving a reason.
Answer the following.
The osmotic pressure of CaCl2 and urea solutions of the same concentration at the same temperature are respectively 0.605 atm and 0.245 atm, calculate van’t Hoff factor for CaCl2.
Which of the following statements is applicable for 0.1 M urea solution and 0.1 M sucrose solution?
What are hypertonic solutions?
Explain the osmotic pressure of a solution with the help of a thistle tube.
Which of the following is a colligative property?
Two solutions have different osmotic pressures. The solution of higher osmotic pressure is called ____________.
20 g of a substance were dissolved in 500 mL of water and the osmotic pressure of the solution was found to be 600 mm of mercury at 15°C. The molecular weight of the substance is ______.
The temperature at which 10% aqueous solution of (W/V) of glucose will show the osmotic pressure of 16.4 atoms is: (R = 0.082 L atom K−1 mol−1)
Isotonic solutions must have the same:
(i) solute
(ii) density
(iii) elevation in boiling point
(iv) depression in freezing point
Give an example of a material used for making semipermeable membrane for carrying out reverse osmosis.
Blood cells retain their normal shape in solution which are
The vapour pressure of water is 12.3 k pa at 300 k. Calculated the vapour pressure of molal solution in it.
Isotonic solutions are the solutions having the same ______.
A solution containing 10 g glucose has osmotic pressure 3.84 atm. If 10 g more glucose is added to the same solution, what will be its osmotic pressure? (Temperature remains constant)
Write the condition of reverse osmosis.
The 'X' g nonvolatile solute having molar mass 196 g mol-1 is dissolved in 3 dm³ water. Calculate the value of 'X' if resulting solution has osmotic pressure 0.8 atm at 300 К.
(R = 0.0821dm³ atm K-1 mol-1)
