Question

At 20oC a saturated solution of sodium nitrate (NaNO3) contains 86 grams of solute in 100 mL of water. How many grams of sodium nitrate must be added to saturate the solution at 50oC?0 g must be added
29 g must be added
39 g must be added
50 g must be added

Answer 1

So at 20°C, the concentration is 86 g for 100 mL. Look at your solubility curve and you'll see it's saturated. TO remain saturated at 50°C, it needs around 115 g, so I hope you get the answer now (it's 115-86)