The effect of dilution on the pH of an acid

1
The effect of dilution on the pH of an acid
2

• An acid solution
• is diluted by the
• addition of water

3
Universal indicator is added to each solution
lowest pH
most acidic





a) The solution in tube 1 is
b) The solution in tube 1 has the
least acidic
highest pH
4
Universal indicator is added to each solution
decreases


c) As the acid solution is diluted, the pH
increases
5
Universal indicator is added to each solution
d) As the acid solution is diluted the acidity,
increases


decreases
6
lower
e) The the pH of an acid, the greater the
acidity
higher
7
The effect of dilution on the pH of an alkali
8

• An alkali solution
• is diluted by the
• addition of water

9
Universal indicator is added to each solution
most alkaline
highest pH




a) The solution in tube 1 is
b) The solution in tube 1 has the
least alkaline
lowest pH
10
Universal indicator is added to each solution
increases


c) As the alkali solution is diluted, the pH
d) As the alkali solution is diluted the
alkalinity,
decreases
increases


decreases
11
Universal indicator is added to each solution
lower
e) The the pH of an alkali, the greater the
alkalinity
higher
12
Page 81
MORE ABOUT ACIDS AND ALKALIS
diluting an acid
diluting an alkali
1 2 3 4 5 6
8 9 10 11 12 13 14
7
HYDROCHLORIC ACID
SODIUM HYDROXIDE
LEMONADE
OVEN CLEANER
Which of these solutions is the most acidic?
Which of these solutions is the most alkaline?