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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:
  1. The volume expansion upon mixing the two pure liquids is 3.33%
  2. Mole fraction of formic acid in the solution is 950 
  3. The volume contraction upon mixing the two pure liquids is 6.66%
  4. % w/v of the resulting solution will be 3813%


Solution

The correct option is C 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
=605660×100=6.66%XHCOOH=1.15×20461.15×2046+4018=949
% w/v=wtHCOOHVsol×100=2356×100=41.07%

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