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Osmosis

9. An importa...

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9. An important method of removing soluble impurities of solution is: Dialysis Peptization Sedimentation All of the above

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Q. Assertion :The dialysis a technique for purification of sol is used to remove the soluble and insoluble impurities present in sol. Reason: The dialysis is based on different rate of diffusion of true solution and collodial solution particles.

K I

drop by drop to

A g N O_{3}

aqueous solution gives an impure sol of

A g I

. The impurities needed not to be removed by dialysis is :

Q. Explain the various ways of purifying water and removing soluble and insoluble impurities.

Filtration is a physical method of removing impurities.

Q. Sodium bicarbonate,

N a H {C O}_{3}

, can be purified by dissolving it in hot water (

60^{o} C

), filtering to remove insoluble impurities, cooling to

0^{o} C

to precipitate solid

N a H {C O}_{3}

, and then filtering to remove the solid, leaving soluble impurities in solution. Any

N a H {C O}_{3}

that remains in the solution is not recovered. The solubility of

N a H {C O}_{3}

in hot water at

60^{o} C

164 g / l i t r e

69 g / l i t r e

in cold water at

0^{o} C

. What is the percentage yield of

N a H {C O}_{3}

, when it is purified by this method?

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