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 $
