A solution of NH4CI is prepared by dissolving 95 g of NH4CI in 200 g of H2O at 60° C. What is mass per cent when the solution is cooled to 20° C based on this
  • a)
    23%
  • b)
    36%
  • c)
    42%
  • d)
    72%
Correct answer is option 'B'. Can you explain this answer?

Class 12 Question

Mayank
Mar 27, 2019
(b) 200 g H2O at 60°C has 95 g NH4Cl
Based on solubility graph, at 20°C,
100 g of H2O can dissolve = 36 g NH4CI
hence, 200 g of H20 can dissolve = 72g  NH4CI
Thus, NH4CI separated (crystallised) = 95 - 72 = 23 g
Mass % = 36%

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