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Q4. a) Define molarity. How it changes with temperature?and has density 1.8 g/ml, whathat volume of thisb)Concentrated solution of sulphuric acid is 98% by massacid is required to prepare one litre of 0.1 M H2S04 solution.The work function of the metal is 2.13 ev.co |
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Answer» Molarity is affected by the temperature . molarity is the ratio between number of moles of solute to the volume of solution in litres and as on increasing temperature the volume increases and hence with the increase in temperature the molarity of solution decreases 98% by weight means 98 gm H2SO4 in 100 gm solution or 98 g H2SO4 in 2 g water.Number of moles of H2SO4 = 98/98 = 1Density = 1.8 g/LVolume of solution = Mass of solution/ Density = 100/1.8 = 55.55 ml = 0.055 L Applying,M1V1 = M2V218.18 x V1 = 0.1 x1V1 = 0.0055 L = 5.5 ml Hence , volume of acid required = 5.5 ml |
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