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It is essential to wash a precipitation ...

It is essential to wash a precipitation with water before its quantitative estimation . Why ?

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During precipitation, preferential adsorption of common ion takes place from solutions. This will give error in estimating precipitate quantitatively.
Hence precipitate is washed to desorb the excess ions adhared to the precipitate.
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AAKASH SERIES-SURFACE CHEMISTRY-Objective Excersice - 4 (ASSERTION (A)& REASON (R ) TYPE QUESTION)
  1. It is essential to wash a precipitation with water before its quantita...

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  2. (A) De-emulsification is a reverse process of emulsion formation (...

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  3. (A) Adsorption is endothermic (R ) Adsorption process is accormpan...

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  4. (A) A gas with higher critical temperature is adsorbed more than a gas...

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  5. (A) SO(2) gas is easily liquified while H(2) is difficult to liquify ...

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  6. (A) Adsorption is a surface phenomenon. ( R) Adsorption is an exothe...

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  7. (A) Physisorption is not specific. (R ) Physisorption involves Vand...

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  8. (A)Milk is a naturally occuring stable emulsion . (R ) Milk is an exam...

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  9. (A)Same reactants give different products with different catalysts. ...

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  10. (A)Charcoal is a good adsorbent (R ) Charcoal has highly porous str...

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  11. (A)Water vapours are absorbed by anhydrous calcium chloride (R ) Ab...

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  12. (A)Enthalpy of physical adsorption is lower than chemical adsorption ...

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  13. (A)The reaction of oxalic acid with acidified KMnO(4) first slow and t...

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  14. (A)In Haber's synthesis, the rate of formation of NH(3) is increased b...

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  15. (A)Catalyst increases the rate of reaction. (R ) Catalyst functions...

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  16. (A)A catalyst does not alter the equilibrium constant of a reaction ...

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  17. (A) NH(3) adsorbs more readily over activated charcoal than CO(2) (...

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  18. (A) : Gases between themselves cannot form a colloidal solution. (R)...

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  19. (A) Colloidal sols scatter light while true solutions do not. (R ) ...

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  20. (A) Colloidal particles show Brownian Movement (R ) Brownian movemen...

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  21. (A) A colloidal sol of As(2)S(3) is coagulated faster by 0.1 M BaCl(2)...

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