C2f-acids and bases Flashcards
1
Q
What kind of changes do indicators show?
A
- PH changes
- sudden or gradual changes
- colour changes over different PH ranges
2
Q
What is an alkali?
A
A soluble base
3
Q
What is a universal indicator?
A
A combination of dyes that changes colour
4
Q
What colour does acid turn litmus paper?
A
Red
5
Q
What colour does alkaline turn litmus paper?
A
Blue
6
Q
What colour does litmus paper turn when the solution is neutral?
A
Purple
7
Q
What is the word equation for neutralisation?
A
Acid + base –> salt + water
8
Q
What is the ph of an acid determined by?
A
The concentration of H+ ions
9
Q
What do acids contain?
A
H+ ions
10
Q
What do alkalis contain?
A
OH- ions
11
Q
What is the symbol equation for the reaction of ions in neutralisation?
A
H+ + OH- –> H2O
12
Q
What can neutralise an acid?
A
A base/ alkali and vice versa
13
Q
What is H2SO4?
A
Sulfuric acid
14
Q
What is HNO3?
A
Nitric acid
15
Q
What is HCl?
A
Hydrochloric acid
