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Question

Two saturated aqueous solution A and B using the same solute are prepared at 25°C and 40°C respectively.

The densities of A and B are 1200g/I and 1300g/I at the given temperature 600g of solution A is heated to 40°C from 25°C.

x g of solute is added to it in order to saturate it. Then this solution is cooled to15°C and 75g solute is precipitated.

Consider the density of water as 1 g/cc at all given temperatures and the addition of solute in water does not alter the volume of the solution.

Calculate the density of the solution in g/I at 15°C


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Solution

  1. Density of a solution is calculated by m/v (Mass/Volume)
  2. Mass of the solute precipitated at 15°C = 75g
  3. Density of water =1g/cc
  4. 100g of water can dissolve =755= 15g of solute
  5. The volume of mass of solution at 15°C = 100+15 = 115g
  6. Density=massvolume=1150.1g/L=1150g/L

The Density of the solution in g/l at 15°C is 1150g/l


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