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

Density of a solution is calculated by m/v (Mass/Volume)
Mass of the solute precipitated at 15°C = 75g
Density of water =1g/cc
100g of water can dissolve = $\frac{75}{5}$ = 15g of solute
The volume of mass of solution at 15°C = 100+15 = 115g
$Density= \frac{m a s s}{v o l u m e} = \frac{115}{0.1} g / L = 1150 g / L$
The Density of the solution in g/l at 15°C is 1150g/l

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