Some Basic Concepts Of Chemistry Question 11

Question: To neutralize completely 20 mL of 0.l M aqueous solution of phosphorus ( $ H _3PO _3 $ ) acid the volume of 0.1 M aqueous KOH solution required is

Options:

A) 60 mL

B) 20 mL

C) 40 mL

D) 10 mL

Show Answer

Answer:

Correct Answer: C

Solution:

Meq. of $ H _3PO _3 $ = Meq. of KOH $ M _1V _1\times $ Basicity = $ M _2V _2\times $ Acidity $ 20\times 0.1\times 2=V\times 0.1\times 1 $
$ \therefore $ V=40 mL



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