CHAPTER 18 – SOLUTIONS AND SOLUBILITY Types of solutions
The term concentration is used to describe how much solute is dissolved in the solvent in a solution. It is measured in g/l (grams per litre). • A dilute solution contains a small amount of solute dissolved in a large amount of solvent. • A concentrated solution contains a large amount of solute in a small amount of solvent. • A saturated solution contains as much solute as can dissolve at a given temperature.
Add more copper sulfate
Add more copper sulfate
)Fig. 18.6 Dilute, concentrated and saturated solutions
? TEST TUBE
2. Using the diagram below, answer the questions that follow. Each circle represents a particle of the solute.
Dilute copper sulfate solution
Concentrated copper sulfate solution
Saturated copper sulfate solution
500 cm3 Solution A
:Fig. 18.7
a. Which solution is most concentrated? b. Which solution is least concentrated? c. Which two solutions have the same concentration?
d. When solutions E and F are combined, the resulting solution has the same concentration as which solution?
e. If you evaporate half of the water in solution B, the resulting solution has the same concentration as which solution?
500 cm3 Solution B
500 cm3 Solution C
500 cm3 Solution D
250 cm3 Solution E
250 cm3 Solution F
FIGURE IT OUT!
Convert the following concentrations to grams per 100 cm3 Example
1 g of citric acid in 10 cm3 a. 15 g of salt in 50 cm3
b. 10 g of copper sulfate in 25 cm3 c. 20 g of sugar in 75 cm3
of water of water Elements of Science 177 :
of water is equal to 10 g of citric acid in 100 cm3 of water