Question

solubility curves practice: use the solubility curve to answer the questions. add color to the curve to help you!
for questions 1 - 4, an amount of solute is given and a temperature is stated. if all of the solute could be dissolved in 100 g of water at the given temperature, would the resulting solution be unsaturated, saturated or supersaturated?

1. 60g of nano₃ at 70 c
2. 10 g of kclo₃ at 60 c
3. 80 g of nano₃ at 10 c
4. 70 g of ki at 20 c

for questions 5 - 8, a solute and a temperature are given. tell how many grams of each solute must be added to 100g of water to form a saturated solution at the given temperature.

1. nh₃ at 10 c
2. hcl at 50 c
3. nh₄cl at 20 c
4. kno₃ at 40 c

show your work and circle your final answer

1. if 115g of kno₃ are added to 100g of water at 35c, how many grams do not dissolve?
2. what mass of kcl would be needed to form a saturated solution if the kcl was dissolved in 200g of water at 80c?

Explanation:

Step1: Locate solubility of $NaNO_3$ at 70°C

From the solubility - curve, the solubility of $NaNO_3$ at 70°C is about 140 g per 100 g of water. Since 60 g of $NaNO_3$ is added and 60<140, the solution is unsaturated.

Step2: Locate solubility of $KClO_3$ at 60°C

From the solubility - curve, the solubility of $KClO_3$ at 60°C is about 23 g per 100 g of water. Since 10 g of $KClO_3$ is added and 10<23, the solution is unsaturated.

Step3: Locate solubility of $NaNO_3$ at 10°C

From the solubility - curve, the solubility of $NaNO_3$ at 10°C is about 80 g per 100 g of water. Since 80 g of $NaNO_3$ is added, the solution is saturated.

Step4: Locate solubility of $KI$ at 20°C

From the solubility - curve, the solubility of $KI$ at 20°C is about 140 g per 100 g of water. Since 70 g of $KI$ is added and 70<140, the solution is unsaturated.

Step5: Locate solubility of $NH_3$ at 10°C

From the solubility - curve, the solubility of $NH_3$ at 10°C is about 70 g per 100 g of water. So 70 g of $NH_3$ must be added to 100 g of water to form a saturated solution.

Step6: Locate solubility of $HCl$ at 50°C

From the solubility - curve, the solubility of $HCl$ at 50°C is about 40 g per 100 g of water. So 40 g of $HCl$ must be added to 100 g of water to form a saturated solution.

Step7: Locate solubility of $NH_4Cl$ at 20°C

From the solubility - curve, the solubility of $NH_4Cl$ at 20°C is about 37 g per 100 g of water. So 37 g of $NH_4Cl$ must be added to 100 g of water to form a saturated solution.

Step8: Locate solubility of $KNO_3$ at 40°C

From the solubility - curve, the solubility of $KNO_3$ at 40°C is about 65 g per 100 g of water. So 65 g of $KNO_3$ must be added to 100 g of water to form a saturated solution.

Step9: Locate solubility of $KNO_3$ at 35°C

From the solubility - curve, the solubility of $KNO_3$ at 35°C is about 60 g per 100 g of water. If 115 g of $KNO_3$ are added, the amount that does not dissolve is 115 - 60=55 g.

Step10: Locate solubility of $KCl$ at 80°C

From the solubility - curve, the solubility of $KCl$ at 80°C is about 50 g per 100 g of water. For 200 g of water, the amount of $KCl$ needed to form a saturated solution is 50×2 = 100 g.

Answer:

1. Unsaturated
2. Unsaturated
3. Saturated
4. Unsaturated
5. 70 g
6. 40 g
7. 37 g
8. 65 g
9. 55 g
10. 100 g