The solubility of a substance S in water is 28.6% ( mass by volume at 50°C . When 50ml of its saturated solution at 50°C is cooled to 40°C, 2.4g of solid S separates out. The solubility of S in water at 40°C ( mass by volume ) is ??
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» Given solubility of S = 28.6% at 50°C in water.
Amount of solute in 50mL of saturated solution
= 28.6/2 = 14.3g at 50°C ....(i)
At 40°C amount of S separates out = 2.4g in 50ml ...(ii)
from eq.(i) and (ii)
Remaining solute = 14.3g - 2.4g = 11.9g in 50ml
.°. Solubility of S at 40°C = 11.9/50×100
= 23.8%
Amount of solute in 50mL of saturated solution
= 28.6/2 = 14.3g at 50°C ....(i)
At 40°C amount of S separates out = 2.4g in 50ml ...(ii)
from eq.(i) and (ii)
Remaining solute = 14.3g - 2.4g = 11.9g in 50ml
.°. Solubility of S at 40°C = 11.9/50×100
= 23.8%
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