At what temperature would a solution be saturated if $65g$ of potassium chloride is

present in $150mL$ of water?

$500g$ of cesium sulphate is added to $200mL$ of water at $20C.$ If $127g$ sinks to

the bottom of the container, what is the solubility of cesium sulphate in water at

$20C?$

A beaker containing $80$ grams of lead$($II$)$ nitrate, $Pb(N{O}_3{)}_2,$ in $100$ grams of water

has a temperature of $30C.$ Approximately how many grams of the salt are

undissolved, on the bottom of the beaker?