C3.3.2 - The pH scale Flashcards
1
Q
What is an acid?
A
A substance that ionises in water, releasing hydrogen ions
2
Q
What is a base?
A
A substance that neutralises acids forming a salt and water only
3
Q
What is an alkali?
A
A soluble base
4
Q
What is pH?
A
The relative acidity of alkalinity of an aqueous solution
5
Q
What is the pH scale?
A
A scale that measures relative acidity or alkalinity of an aqueous solution
6
Q
What does pH<7 mean?
A
It is acidic
7
Q
What does pH = 7 mean?
A
It is neutral
8
Q
What does pH > 7 mean?
A
It is alkaline