indicators and pH

Question 1

what are the pH levels of strong acids to strong alkalis

Answer 1

pH 0–2 strong acid–
pH 3–6 weak acid–
pH 7 neutral–
pH 8–11 weak alkali–
pH 12–14 strong alkali

Question 2

what are indicators

Answer 2

Indicators are chemicals which can change colour in acidic/neutral/alkaline solutions.

Question 3

what colours do red litmus papers go in these…
colour in acid
solution
Colour in neutral solution-
Colour in alkaline solution

Answer 3

red
red
blue

Question 4

what colours do red litmus papers go in these…
colour in blue
solution
Colour in neutral solution-
Colour in alkaline solution

Answer 4

red
blue
blue

Question 5

how can pH be measured

Answer 5

ph meter
universal indicator paper

Question 6

what colour do these pH levels go in universal indicator paper
pH
0-2 strong acid
3-4 weak acid
5-6 weak acid
7 neutral
8-9 weak alkali
10-11 weak alkali
12-14 strong alkali

Answer 6

0-2 red
3-4 orange
5-6 yellow
7 green
8-9 green/blue
10-11 blue
12-14 dark blue/purple