On heating 25g of a saturated solution to dryness at 60°c,4g of an hydrous salt was recover , calculate the solubility in g/100g of solvent
To find the solubility of the salt in g/100g of solvent, we first need to determine the mass of the solvent in the original saturated solution.
Let's assume the original saturated solution contained x grams of the solvent. Since 25g of the saturated solution was heated to dryness and 4g of the salt was recovered, this means that the remaining mass after heating was 25g - 4g = 21g.
Since the saturated solution was still present when it was heated to dryness, the remaining 21g must have contained the solute (salt) at the same concentration as the original saturated solution.
Therefore, the mass of the salt in the original saturated solution would be 25g - 21g = 4g.
Now we can calculate the solubility in g/100g of solvent:
Solubility = Mass of solute/Mass of solvent x 100
= 4g/x x 100
= 400/x
Since x is the mass of the solvent in grams, the solubility of the salt in g/100g of solvent is 400/x.