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# Graphing: Solubility

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Unit 3 Methods: Solutions

Graphing: Solubility

What do the numbers on the y-axis represent?
What does each curve on the graph represent?
Which substances show increasing solubility with increasing temperature?
Which substances show decreasing solubility with increasing temperature?
Which salt is most soluble at 10oC?
Which salt is most soluble at 60 oC?
Which salt is most soluble at 80 oC?
If you heat water to 80oC, what amount of NaCl would dissolve compared to water at 20oC?
Which salt's solubility is most strongly affected by changes in temperature?

Graphing II

Use the graph above to explain freezing point depression.

Use the graph above to explain boiling point elevation.
Explain how addition of salt to water would effect cooking at higher elevations.

Calculating Parts per Million
1. A 150 g sample of water contains 0.26 mg of cadmium ions. Determine the concentration in parts per million (ppm) 1.
2. A sample of 300.0 g of drinking water is found to contain 38 mg Pb.
Determine the concentration in ppm. 2.
3. A solution of lead sulfate (PbSO4) contains 0.425 g of PbSO4 in 100.0 g water.
Determine the concentration in ppm. 3.
4. A 900.0 g sample of sea water is found to contain 6.7 x 10-3 g zinc.
Determine the concentration in ppm 4.
5. A 365.0 g sample of water contains 23 mg gold.
Determine the amount of gold in the sample in ppm 5.
Calculating Molarity
6. Vinegar contains 5.0 g of acetic acid (CH3COOH) in 100.0 mL of solution.
Determine the molarity of acetic acid in vinegar. 6.
7. A solution of silver nitrate (AgNO3) contains 29.66 g of solute in 100.0 mL of solution.
Determine the molarity of the solution. 7.
8. A solution of lead sulfate (PbSO4) contains 0.425 g of PbSO4 in 100.0 g water.
Determine the molarity of the solution. 8.
9. Determine the mass of potassium bromide (KBr) present in 25 mL of a 0.85 M solution of KBr 9.
10. If all the water in 430.0 mL of a 0.45 M NaCl solution evaporates, what mass of salt will remain? 10.

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#### Solution Preview

Graphing: Solubility

What do the numbers on the y-axis represent? The y-axis represents to mass(g) of pure compound which is soluble in 100 g of water at the temperature displayed on the x-axis.
What does each curve on the graph represent? As the temperature (x-axis) of the water increases from 0° - 100 °C the mass of compound which will dissolve at this temperature is plotted along the different curves.
yellow curve -> KNO3
lt blue curve -> NaNO3
red curve -> NaOCCH3
purple curve -> KH4¬Cl
navy blue curve -> LiSO4
lt. green curve -> KCl
Which substances show increasing solubility with increasing temperature? Those curves with a positive slope show an increasing solubility with rising solvent (H2O) temperature. KNO3, NaNO3, NaOOCCH3, NH4Cl, and KCl
Which substances show decreasing solubility with increasing temperature? The curves with a negative slope show an decreasing solubility with rising solvent (H2O) temperature: NaCl, LiSO4.
Which salt is most soluble at 10oC? At 10 ° C NaNO3 (blue line) shows the highest solubility, 170 g/ 100 g H2O @ 10°C.
Which salt is most soluble at 60 oC? At 60 ° C NaOOCCH3 (red line) shows the highest solubility, 140 g/ 100g H2O @ 60°C.
Which salt is most soluble at 80 oC? At 80 °C KNO3 (dark yellow line) shows the highest solubility, 80g/ 100 g H2O @ 80°C.
If you heat water to 80oC, what amount of NaCl would dissolve compared to water at 20oC? The solubility of ...

#### Solution Summary

The solution provides so theoretical practical problems to develop a better understanding of some critical chemistry concepts. These concepts include Morality, Freezing Point Depression, Boiling Point Elevation, and Concentration( ppm).

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