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Answer the following. Explain reverse osmosis. - Chemistry

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प्रश्न

Answer the following.

Explain reverse osmosis.

थोडक्यात उत्तर
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उत्तर

i. If a pressure larger than the osmotic pressure is applied to the solution side, then pure solvent from the solution passes into pure solvent side through the semipermeable membrane. This phenomenon is called reverse osmosis.

ii. For example, consider fresh water salt water separated by a semipermeable membrane. When the pressure larger than the osmotic pressure of a solution is applied to solution, pure water from salty water passes into fresh pure water through the membrane. Thus, the direction of osmosis can be reversed by applying a pressure larger than the osmotic pressure.

iii. The schematic set up for reverse osmosis is as follows:

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पाठ 2: Solutions - Exercises [पृष्ठ ४६]

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बालभारती Chemistry [English] Standard 12 Maharashtra State Board
पाठ 2 Solutions
Exercises | Q 3.5 | पृष्ठ ४६

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संबंधित प्रश्‍न

Which of the following is not a colligative property?


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?


Calculate the osmotic pressure in pascals exerted by a solution prepared by dissolving 1.0 g of polymer of molar mass 185,000 in 450 mL of water at 37°C.


At 300 K, 36 g of glucose present in a litre of its solution has an osmotic pressure of 4.98 bar. If the osmotic pressure of the solution is 1.52 bars at the same temperature, what would be its concentration?


Define osmotic pressure.


Define Semipermeable membrane


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)


Calculate the mass of a compound (molar mass = 256 g mol−1) to be dissolved in 75 g of benzene to lower its freezing point by 0.48 K (Kf = 5.12 K kg mol−1).


Define the following term:

Hypotonic solution


Choose the most correct option.

In calculating osmotic pressure the concentration of solute is expressed in _______.


Answer the following in one or two sentences.

What is osmotic pressure?


Answer the following.

What are isotonic and hypertonic solutions?


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.


Answer the following.

How molar mass of a solute is determined by osmotic pressure measurement?


An aqueous solution of a certain organic compound has a density of 1.063 g mL-1 , osmotic pressure of 12.16 atm at 25 °C and a freezing point of 1.03 °C. What is the molar mass of the compound?


Which of the following statements is applicable for 0.1 M urea solution and 0.1 M sucrose solution?


Which of the following is a colligative property?


Two solutions have different osmotic pressures. The solution of higher osmotic pressure is called ____________.


Osmotic pressure of a solution is 0.0821 atm at a temperature of 300 K. The concentration in moles/litre will be:


A solution containing 10 g per dm3 of urea (molar mass 60 g mol−1) is isotonic with 5% solution of non-volatile solute, MB of solute is:


Give an example of a material used for making semipermeable membrane for carrying out reverse osmosis.


Match the items given in Column I and Column II.

Column I Column II
(i) Saturated solution (a) Solution having same osmotic
pressure at a given temperature as
that of given solution.
(ii) Binary solution (b) A solution whose osmotic
pressure is less than that of another.
(iii) Isotonic solution (c) Solution with two components.
(iv) Hypotonic solution (d) A solution which contains maximum
amount of solute that can be
dissolved in a given amount of
solvent at a given temperature.
(v) Solid solution (e) A solution whose osmotic pressure
is more than that of another.
(vi) Hypertonic solution (f) A solution in solid phase.

How can you remove the hard calcium carbonate layer of the egg without damaging its semiprermiable membrane? Can this egg be inserted into a bottle with a narrow neck without distorting its shape? Explain the process involved.


Isotonic solutions have same


Blood cells retain their normal shape in solution which are


The following solutions were prepared by dissolving 10 g of glucose (C6H12O6) in 250 ml of water (P1), 10 g of urea (CH4N2O) in 250 ml of water (P2) and 10 g of sucrose (C12H22O11) in 250 ml of water (P3). The right option for the decreasing order of osmotic pressure of these solutions is


Derive an expression to calculate molar mass of non-volatile solute by osmotic pressure measurement.


Assertion (A) : Osmotic pressure is a colligative property.

Reason (R) : Osmotic pressure is proportional to the molality.


Determine the osmotic pressure of a solution prepared by dissolving 2.32 × 10−2 g of K2SO4 in 2L of solution at 25°C assuming that K2SO4 is completely dissociated.

(R = 0.082 L atm K−1 mol, Molar mass K2SO4 = 174 g mol−1)


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)


Prove that: M2 = `(W_2RT)/(πV)`.


Arrange the following solutions in the order of increasing osmotic pressure (π) assuming complete ionization.

  1. 0.5M Li2 SO4
  2. 0.5M KCl
  3. 0.5M Al2 (SO4)3 
  4. 0.1 M BaCl2

Define reverse osmosis.


Write the condition of reverse osmosis.


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