Solutions Question 167

Question: A solution of $ Al_2{{(SO_4)}_3},{d=1.253,gm/ml} $ contain 22% salt by weight. The molarity, normality and molality of the solution is [MP PET 2004]

Options:

A) 0.805 M, 4.83 N, 0.825 M

B) 0.825 M, 48.3 N, 0.805 M

C) 4.83 M, 4.83 N, 4.83 M

D) None

Show Answer

Answer:

Correct Answer: A

Solution:

Molarity $ =\frac{perc.\times 10\times d}{GMM} $

$ =\frac{22\times 10\times 1.253}{342}=0.805M $ . Normality $ =\frac{perc.\times 10\times d}{GEM} $

$ =\frac{22\times 10\times 1.253}{342/6}=4.83N $ Molality $ =\frac{22\times 1000}{342(100-22)}=0.825m $



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