Question

The mass of lead bromide that is dissolved in 250 mL of a saturated solution is____ grams.

Answer 1

Depends on the temperature of the solution. At zero C, .455g of lead bromide can be dissolved in 100g water. At 100C, about ten times that can be dissolved.

Answer 2

For salts in pure water & with low solubilities, the molar amount of compound delivered into solution can be calculated from simple formulas based on ionization ratios ...

Salt--(Ionz'n Ratio)--Solubility(S)
AB => 1:1 => S = (Ksp)ª; a = ½
AB₂ & A₂B => 1:2 or 2:1 => S = (Ksp/4)ª; a = ⅓
AB₄ or A₄B => 1:4 or 4:1 => S = (Ksp/256)ª; a =⅕
A₂B₃ or A₃B₂ => 2:3 or 3:1 => S = (Ksp/108)ª; a =⅕