20 mL of calcium hydroxide was consumed when it was reacted with 10 mL of unknown solution of H 2 SO 4 . Also 20 mL standard solution of 0.5 M HC1 containing 2 drops of phenolphthalein was titrated with calcium hydroxide, the mixture showed pink colour when burette displayed the value of 35. 5 mL whereas the burette showed 25.5 mL initially. The concentration of H 2 SO 4 is_______M. (Nearest integer)
Text Solution
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(1) Titration principle is N 1 V 1 = N 2 V 2
N=Normality
V = Volume of solution
M 1 V 1 n 1 = M 2 V 2 n 2
M = molarity
n = Valence factor of acid or base
As pink colour is obtained on consumption of 10 ml of Ca(OH) 2 , we have
20x0.5x1= 10xMx2
Molarity of Ca (OH) 2 = 
Also, moles of Ca(OH) 2 = mm of H 2 SO 4
x 20 = 10 x M Molarity of H 2 SO 4 = 1M
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