U1-3-1 - The pH Scale Flashcards
1
Q
What is pH?
A
A number that measures how acidic or alkaline something is.
Usually 0–14
2
Q
Acidic solutions have pH…
A
less than 7.
3
Q
Alkaline solutions have pH…
A
more than 7.
4
Q
Neutral solutions have pH…
A
equal to 7.
5
Q
Colour of universal indicator in neutral solutions
A
Green
6
Q
Colour of universal indicator in alkalis
A
Blue/purple
7
Q
Colour of universal indicator in acid
A
Red
(red/orange/yellow)
8
Q
Ions which make a solution acidic
A
H+ (hydrogen)
9
Q
Ions which make a solution alkaline
A
OH– (hydroxide)
10
Q
Formula for hydrochloric acid
A
HCl
11
Q
Formula for sulfuric acid
A
H2SO4
12
Q
Formula for nitric acid
A
HNO3
13
Q
Acid
A
Substance which contains hydrogen ions (H+)
14
Q
Alkali
A
Substance which contains hydroxide ions (OH–)
15
Q
Why is water neutral?
A
Equal numbers of H+ and OH– ions.
