    Question

# 20 mL of the pure formic acid (HCOOH) liquid is mixed with 40 mL of pure water to prepare a solution. If the density of pure formic acid liquid, pure water and the solution are 1.15 g/mL ,1 g/mL and 98 g/mL, then:

A
The volume expansion upon mixing the two pure liquids is 3.33%
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B
The volume contraction upon mixing the two pure liquids is 6.66%
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C
Mole fraction of formic acid in the solution is 950
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D
% w/v of the resulting solution will be 3813%
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Solution

## The correct option is B The volume contraction upon mixing the two pure liquids is 6.66%(Vmix)actual=mmixdmix=mHCOOH+mH2Odmix =1.15×20+1×409/8=56 mL (Vmix)expected=20+40=60 mL ∴ % contraction in volume =60−5660×100=6.66%XHCOOH=1.15×20461.15×2046+4018=949 ⇒% w/v=wtHCOOHVsol×100=2356×100=41.07%  Suggest Corrections  3      Similar questions
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