Imagine that you mix 50g of a solute with 100g of water at 40 degrees celsius.

Classify each solute by whether it would completely or partially dissolve under these conditions.

NaNo3, K2Cr2O7, KCl, KClO3, KNO3

NaNO₃ It will completely dissolve

K₂Cr₂O₇ It will partially dissolve

KCl It will partially dissolve

KClO₃ It will partially dissolve

KNO₃ It will completely dissolve

Explanation:

To know if a certain amount of solute will dissolve we need to consider its solubility, which is the maximum amount of solute that can be dissolved in 100 g of solvent at a certain temperature.

Imagine that you mix 50g of a solute with 100g of water at 40 °C.

Classify each solute by whether it would completely or partially dissolve under these conditions.

NaNO₃. The solubility of NaNO₃ at 40°C is 102 g NaNO₃/100 g H₂O. It will completely dissolve.

K₂Cr₂O₇. The solubility of K₂Cr₂O₇ at 40°C is 26.3 g K₂Cr₂O₇/100 g H₂O. 26.3 g will dissolve and 50 g - 26.3 g = 23.7 g will precipitate. It will partially dissolve.

KCl. The solubility of KCl at 40°C is 40.1 g KCl/100 g H₂O. 40.1 g will dissolve and 50 g - 40.1 g = 9.9 g will precipitate. It will partially dissolve.

KClO₃. The solubility of KClO₃ at 40°C is 13.9 g KClO₃/100 g H₂O. 13.9 g will dissolve and 50 g - 13.9 g = 36.1 g will precipitate. It will partially dissolve.

KNO₃. The solubility of KNO₃ at 40°C is 63.9 g KNO₃/100 g H₂O. It will completely dissolve.