Homework answers / question archive / Reading a Solubility Chart Notes on how to read the graph ? The curve shows the # of grams of solute in a saturated solution containing 100 mL or 100 g of water at a certain temperature

Reading a Solubility Chart Notes on how to read the graph ? The curve shows the # of grams of solute in a saturated solution containing 100 mL or 100 g of water at a certain temperature

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Reading a Solubility Chart Notes on how to read the graph ? The curve shows the # of grams of solute in a saturated solution containing 100 mL or 100 g of water at a certain temperature. (1g = 1ml) ? ? ? 150 140 Any amount of solute below the line (or to the right of the line) indicates the solution is unsaturated at a certain temperature 120 Any amount of solute above the line (or to the left of the line) indicates the solution is supersaturated at a certain temperature. Any amount of solute on the line indicates the solution is saturated at a certain temperature. Solutes whose curves move upward w/ increased temperature are typically solids because the solubility of solids increases with increased temperature. KI 130 110 NaNO3 100 grams solute per 100 grams H2O ? Solubility Curves of Pure Substances 90 KNO3 80 70 50 KCl 40 o This also means a low # of grams = low solubility and a high # of grams = high solubility. NH4Cl NH3 60 NaCl 30 20 KClO3 ? Solutes whose curves move downward with increased temperature are typically gases because the solubility of gases decreases with increased temperature. 10 Ce2(SO4)3 0 0 10 20 30 40 50 60 Temperature/Celsuis 70 80 90 100 Name ______________________________________________ Period _____ Score_____ Solubility chart questions Curve shows all salts. 1. Which salt shown on the graph is the least soluble in water at 10oC? Solubility Curves of Pure Substances 150 2. Which salt shown on the graph has the greatest increase in solubility as the temperature increases from 30oC to 60oC? 140 KI 130 120 3. Which of the salts has its solubility affected the least by a change in temperature? 110 NaNO3 4. How many grams must be added to 100g of sodium nitrate, NaNO3, to saturate the solution at 50oC? 5. At what temperature does saturated solutions of potassium nitrate, KNO3, and sodium nitrate, NaNO3, contain the same weight of solute per 100 mL of water? grams solute per 100 grams H2O 100 90 KNO3 80 70 NH4Cl NH3 60 50 KCl 6. What two salts have the same solubility at approximately 3oC? 40 NaCl 30 7. What two salts have the same solubility at approximately 55oC? 8. How many grams of potassium chlorate, KClO3, must be added to 100ml of water to produce a saturated solution at 50oC? 20 KClO3 10 Ce2(SO4)3 0 0 10 20 30 40 50 60 70 80 Temperature/Celsuis 9. What is the temperature at which 30 grams of KCl can be dissolved in 100 mL of water? 10. Why does the NH3 line slope the opposite way of the other substances? (Hint: The answer is on the front) 11. For each of the following solutions label as saturated, unsaturated or supersaturated: a. 40.0 g of KCl in 100 mL of water at 80oC b. 120.0 g of KNO3 in 100 mL of water at 60oC c. 80.0 g of NaNO3 in 100 mL of water at 10oC 90 100 Name ____________________________________________ Period ____ Score _____ Solubility Curve Worksheet Use the solubility chart below to answer the following questions: 1) What is the solubility of potassium nitrate (KNO3) at 300 C? _________________ 2) How many grams of ammonia (NH3) can I dissolve in 200 grams of water at a temperature of 450 C? _________________ 3) At what temperature is the solubility of sodium chloride (NaCl) the same as the solubility of potassium chloride (KCl)? __________________ 4) How many grams of ammonium chloride (NH4Cl) would I need to make 300 grams of a saturated solution at 700 C? __________________ 5) What do all of the compounds that decreased in solubility over the temperature range in the graph have in common? __________________ 6) What compound is least soluble at 400 C? 7) What ionic compound is least soluble at 400 C? __________________ __________________