Acids and bases Flashcards
1
Q
What is a pH scale?
A
- Measure of how acidic or alkaline a solution is
2
Q
Describe the pH scale.
A
- Lower pH, more acidic
- Higher pH, more alkaline
- pH 7 is neutral
3
Q
What dye can you use to measure the pH?
A
- Universal indicator
4
Q
How can you measure a pH electronically?
A
- pH probe attached to pH meter, display numerical value
5
Q
What do acids and bases do to each other?
A
- Neutralise each other
6
Q
What is an acid?
A
- Substance that form aqueous solution less than pH 7
- Form H+ ions in water
7
Q
What is a base?
A
- Substance that react with acid, form salt
8
Q
What is an alkali?
A
- Substance that dissolves in water, form solution with pH greater than pH 7
- Form OH- ions in water
9
Q
Equation for acids and bases:
A
- Neutralisation:
acid + base –> salt + water
10
Q
Equation for acids and bases in terms of ions:
A
H+ (aq) + OH- (aq) –> H2O (l)
11
Q
What is an aqueous solution?
A
- Solution in which water is solvent
12
Q
What is the pH of a neutralised product?
A
- pH 7
