What is the total mass of #KNO_3# that must be dissolved in 50 grams of #H_2O# at 60°C to make a saturated solution?
In order to solve this problem, you must take a look at the solubility graph for potassium nitrate,
Now, the solubility graph shows you how much solute can be dissolved per
You're looking to make a saturated potassium nitrate solution using
As you can see, the curve itself represents saturation.
If you draw a vertical line that corresponds to
Use this as a conversion factor to help you find how much potassium nitrate can be dissolved in
#50color(red)(cancel(color(black)("g water"))) * overbrace("115 g KNO"_3/(100color(red)(cancel(color(black)("g water")))))^(color(purple)("solubility at"color(white)(a) 60^@"C")) = "57.5 g KNO"_3#
You should round this off to one sig fig, since that's how many sig figs you have for the mass of water, but I'll leave it rounded to two sig figs, just for good measure
#m_(KNO_3) = color(green)(|bar(ul(color(white)(a/a)"58 g"color(white)(a/a)|)))#