6.2: The pH scale and indicators

Question 1

pH scale

Answer 1

[0, 7) = acids
[7] = neutral
(7, 14] = bases

suggested by Danish chemist Søren Sørenson
pH - powers of hydrogen
hydrogen concentration increases by powers of ten as the pH gets smaller

Question 2

Determining the pH of a solution

Answer 2

pH meter
litmus paper
universal indicator and pH paper
acid-base indicators (have a range) (natural or synthetic)

Question 3

litmus paper

Answer 3

BLUE litmus turns RED with ACIDS

RED litmus turns BLUE with BASES