1. Mixtures & Solutions
Biology

2. Mixtures
Combination of substances where components retain their own properties
Do not combine chemically
Are the following substances or mixtures?
water
sugar water

3. Solutions
Mixture where one substance is dissolved in another & will not settle out
Solute - substance that dissolves
Solvent - substance it dissolves in
Concentration
The more solute per solvent, the greater the concentration

4. Solution

5. Importance of Solutions
In organisms, many important substance are dissolved in water
Organisms must maintain certain concentrations of solutions
Ex. pancreas keeps concentration of sugar within a certain range

6. Scale to measure the strength of an acid or base Measures from 0-14
pH Scale
Scale to measure the strength of an acid or base
Measures from 0-14
7 is neutral
0-7 is acidic
7-14 is basic

7. pH scale
Each number on the scale is 10X as concentrated as the number before it

8. Quiz Which is more acidic? Which is more basic?
pH 2 or pH 6
pH 5 or pH 7
Which is more basic?
pH 8 or pH 9
pH 10 or pH 8
How much more concentrated is pH 5 than pH 6?
How much more concentrated is pH 14 than pH 12?