# The point at which the water becomes saturated with a

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dissolve, we say the water has become saturated. The point at which the water becomes saturated with a substance indicates the solubility of that substance in water. By performing experiments with different substances such as salt (NaCl), sodium nitrate, and potassium nitrate KNO 3 , scientists learned that these substances have different solubilities in water. Creating a solubility curve of KNO 3 and NH 4 Cl Temperature (°C) Solubility of KNO 3 (per 100 g H 2 0) Solubility of NH 4 Cl (per 100 g H 2 0) 0 14 28 20 34 38 40 62 47 60 105 57 70 134 63 1. Create a graph with the solubility line of KNO 3 , and the solubility line of NH 4 Cl. Temperature is your independent variable . On the y-axis, write Grams of solute/100 grams of H 2 O
Title: _________________________________________________________________ 2. How does the temperature affect the solubility of the solid KNO 3 and NH 4 Cl in water? ________________________________________________________________________ 3. Was the solubility of KNO 3 affected by the higher water temperature in the same way the solubility of NH 4 Cl was? Explain. ________________________________________________________________________ ________________________________________________________________________ 4. Which substances solubility increases more with temperature?____________________ 5. How many grams of KNO 3 can be dissolved in 100g water at 50°C? ______________ 6. How many grams of NH 4 Cl (s) can be dissolved in 100 g of water at 30 °C? ________ 7. At approximately what temperature do the substances have the same solubility? _____ 8. At 20°C, which substance has a greater solubility? _____________________________

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