The graph also shows that solubility increases with increasing temperature.
In general, this is because when the solute dissolves with heat absorption (endothermic dissolution), substances that dissolve with heat release (exothermic dissolution) tend to be less hot soluble.
Solubility curve of some salts
Looking at the graph above about the solubility of some salts, answer:
1) What is the most soluble solute at 0 ° C?
It's KI, because it solubilizes almost 130g in 100g of water.
2) What is the approximate C.S. of NaNO3 at 20 ° C?
3) If the temperature of a solution drops from 70 ° C to 50 ° C, what is approximately the mass of KBr that will precipitate?
70 ° C = 90g
50 ° C = 80g
So: 90-80 = 10g
4) Which salt has solubility impaired by heating?
5) If the KNO3 solubilizes 90g in 100g of water at 50 ° C, how much will it solubilize when there is 50g of water?
x = 45g of KNO salt3
6) What kind of solution would form 80g of NH salt4Cl at 20 ° C?
4% Acetic Acid
Household alcohol employed in cleaning
Grease Crust Removal and Soap Making
NaCl (aqueous) 0.9%
Contact lens cleaning and medicine
Conservation of animal tissue
18 carat gold
5% sodium hypochlorite
Bactericidal and bleach
Regarding the solute / solvent ratio
The solution may be:
- Concentrated: large amount of solute relative to solvent.
Example: H2ONLY4 conc = 98% sulfuric acid + water
- Diluted: small amount of solute relative to solvent.
Diluting means adding more pure solvent to a given solution.
Example: water + pinch of table salt.