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Topic 7: Solutions
8. Saturated solution – Using the solubility curves: Determining how much more salt is needed
to form a saturated solution
1. A solution contains 14 grams of KCl in 100 grams of water at 40 C. What is the maximum amount of
o
KCl that must be added to make this a saturated solution?
1) 14 g 2) 20 g 3) 25 g 4) 54 g
2. How many more grams of KNO3 must be added to a solution containing 90 g of the solute in 100g
o
of water at 60 C? 2) 15 g 3) 30 g 4) 105 g
1) 10 g
o
3. An unsaturated solution of NaNO3 contains 70 grams of NaNO3 dissolved in 100 g of water at 20 C.
How many more grams of NaNO3 are needed to make this a saturated solution?
1) 70 g 2) 95 g 3) 30 g 4) 18 g
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Teacher Preview Copy
4. A saturated solution of HCl is to be prepared. How many more grams of HCl are needed in a solution
o
containing 100 grams of the solute in 200 grams of water at 20 C to make this a saturated solution?
1) 44 g 2) 72 g 3) 144 g 4) 100 g
5. What amount of potassium chloride must be added to a solution made by dissolving 80 g of the
o
solute in 200 grams of H2O at 60 C to produce a saturated solution?
1) 45 g 2) 160 g 3) 100 g 4) 120 g
6. A student dissolved only 40 grams of NaCl in 80 grams of water that is at 90 C. To make this a
o
saturated solution, the student must add to the solution
1) 10 grams of NaCl 3) 10 g of H2O
2) 20 grams of NaCl
4) 20 g of H2O
7. A student found a potassium iodide solution that was prepared by dissolving 120 grams of the salt in
o
100 g of water at 10 C. To make a saturated solution of this substance, the student must add
1) 15 grams of potassium iodide 3) 20 g of potassium iodide
2) 15 grams of water 4) 20 g of water
9. Saturated solution – Using the Solubility Curve Table: Determine the amount of solute
that will precipitate (re-crystallized)
o
1. A saturated solution of KNO3 is prepared with 100 grams of water at 70 C. According to Reference
o
Table G, what amount of KNO3 will precipitate if the solution is cooled to 50 C ?
1) 215 g 2) 55g 3) 135 g 4) 20 g
o
2. One hundred grams of water is saturated with NH4Cl at 50 C. If the temperature of the solution is
o
decreased to 10 C, what amount of the solute will precipitate?
1) 5 g 2) 17 g 3) 30 g 4) 50 g
3. When the temperature of a saturated solution of KClO3 that is made with 100 g of H2O is cooled from
o
25 C to 10 C, some salt crystals reformed at the bottom of the beaker. How many grams of the
KClO3 salt is at the bottom of the beaker? 3) 15 g 4) 20 g
2) 10 g
1) 5 g
4. A test tube contains a saturated solution of KNO3 that was prepared with 100 grams of H2O at 60 C.
o
o
If the test tube is cooled to 30 C, what will be found at the bottom of the test tube?
1) 30 grams of KNO3 3) 57 g of KNO3
2) 30 g of H2O
4) 57 g of H2O
5. A test tube containing a saturated solution is cooled from 30 C to 10 C. If the test tube contains a
o
o
saturated solution of sodium nitrate made with 100 g of water, what will be found at the bottom of
the test tube? 3) 15 grams of sodium nitrate
1) 15 grams of water
2) 20 grams of water 4) 20 grams of sodium nitrate
Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 237
Topic 7: Solutions
8. Saturated solution – Using the solubility curves: Determining how much more salt is needed
to form a saturated solution
1. A solution contains 14 grams of KCl in 100 grams of water at 40 C. What is the maximum amount of
o
KCl that must be added to make this a saturated solution?
1) 14 g 2) 20 g 3) 25 g 4) 54 g
2. How many more grams of KNO3 must be added to a solution containing 90 g of the solute in 100g
o
of water at 60 C? 2) 15 g 3) 30 g 4) 105 g
1) 10 g
o
3. An unsaturated solution of NaNO3 contains 70 grams of NaNO3 dissolved in 100 g of water at 20 C.
How many more grams of NaNO3 are needed to make this a saturated solution?
1) 70 g 2) 95 g 3) 30 g 4) 18 g
o Teacher Preview Copy
Teacher Preview Copy
4. A saturated solution of HCl is to be prepared. How many more grams of HCl are needed in a solution
o
containing 100 grams of the solute in 200 grams of water at 20 C to make this a saturated solution?
1) 44 g 2) 72 g 3) 144 g 4) 100 g
5. What amount of potassium chloride must be added to a solution made by dissolving 80 g of the
o
solute in 200 grams of H2O at 60 C to produce a saturated solution?
1) 45 g 2) 160 g 3) 100 g 4) 120 g
6. A student dissolved only 40 grams of NaCl in 80 grams of water that is at 90 C. To make this a
o
saturated solution, the student must add to the solution
1) 10 grams of NaCl 3) 10 g of H2O
2) 20 grams of NaCl
4) 20 g of H2O
7. A student found a potassium iodide solution that was prepared by dissolving 120 grams of the salt in
o
100 g of water at 10 C. To make a saturated solution of this substance, the student must add
1) 15 grams of potassium iodide 3) 20 g of potassium iodide
2) 15 grams of water 4) 20 g of water
9. Saturated solution – Using the Solubility Curve Table: Determine the amount of solute
that will precipitate (re-crystallized)
o
1. A saturated solution of KNO3 is prepared with 100 grams of water at 70 C. According to Reference
o
Table G, what amount of KNO3 will precipitate if the solution is cooled to 50 C ?
1) 215 g 2) 55g 3) 135 g 4) 20 g
o
2. One hundred grams of water is saturated with NH4Cl at 50 C. If the temperature of the solution is
o
decreased to 10 C, what amount of the solute will precipitate?
1) 5 g 2) 17 g 3) 30 g 4) 50 g
3. When the temperature of a saturated solution of KClO3 that is made with 100 g of H2O is cooled from
o
25 C to 10 C, some salt crystals reformed at the bottom of the beaker. How many grams of the
KClO3 salt is at the bottom of the beaker? 3) 15 g 4) 20 g
2) 10 g
1) 5 g
4. A test tube contains a saturated solution of KNO3 that was prepared with 100 grams of H2O at 60 C.
o
o
If the test tube is cooled to 30 C, what will be found at the bottom of the test tube?
1) 30 grams of KNO3 3) 57 g of KNO3
2) 30 g of H2O
4) 57 g of H2O
5. A test tube containing a saturated solution is cooled from 30 C to 10 C. If the test tube contains a
o
o
saturated solution of sodium nitrate made with 100 g of water, what will be found at the bottom of
the test tube? 3) 15 grams of sodium nitrate
1) 15 grams of water
2) 20 grams of water 4) 20 grams of sodium nitrate
Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 237
