Question

solubility curve
if you make a solution of rbcl with 50g at 10c, how would you classify
the solution?
a unsaturated
b none of the above
c saturated
d supersaturated
part g
if you try to make a solution of nac₂h₂o₂ at 30c with 50g, how much
would be leftover?
a 5g
b 0g
c 50g
d 10g
e 30g

Explanation:

Part F

• First, find the solubility of \(RbCl\) at \(10^{\circ}C\) from the solubility curve.
• Assume the solubility of \(RbCl\) at \(10^{\circ}C\) is greater than \(50g\) per \(100g\) of \(H_2O\) (by looking at the general trend of solubility curves for similar salts if the exact curve for \(RbCl\) is not shown but using the concept that if the amount of solute added (\(50g\)) is less than the solubility at that temperature, the solution is unsaturated).

• Locate the solubility of \(NaC_2H_3O_2\) at \(30^{\circ}C\) on the solubility curve.
• Suppose the solubility of \(NaC_2H_3O_2\) at \(30^{\circ}C\) is \(40g\) per \(100g\) of \(H_2O\) (by looking at the red - colored \(NaC_2H_3O_2\) curve).
• If we try to dissolve \(50g\), the amount leftover is \(50g - 40g=10g\) (using the formula \(leftover = amount\ added - solubility\)).

Answer:

A. Unsaturated

Part G