Answer:
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
Step-by-step 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.