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Some Basic Concepts of Chemistry
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14/08/2021 11:01 am
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When 2.5 g of a sample of Mohr's salt reacts completely with 50 mL of N/10 KMnO4 solution. The % purity of the sample of Mohr's salt is:
(a) 78.4
(b) 70
(c) 37
(d) 40
1 Answer
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14/08/2021 11:06 am
Topic starter
Correct answer: (a) 78.4
Explanation:
m-eq.FeS4(NH4)2SO4 .6H2O
= m-eq. of KMnO4 (n = 1)
\(\frac{W}{392}\)x 1 x 1000 = 0.1 x 50
Hence, % purity of Mohr's salt
W = 1.96 g
= \(\frac{1.96}{2.5}\) x 100
= 78.4%