Q.

29.2% (w/w) HCl stock solution has a density of 1.25 g/L. The volume  (ml) of stock solution required to prepare a 200 ml solution of 0.4 M HCl is______ 

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answer is 8.

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Detailed Solution

M=d×w/w(%)×10G.M.W
M=1.25×29.2×1036.5
=10M
M1V1=M2V2
10×V1=0.4×200
10×V=80
V=8ml

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29.2% (w/w) HCl stock solution has a density of 1.25 g/L. The volume  (ml) of stock solution required to prepare a 200 ml solution of 0.4 M HCl is______