PH Indicators

Tick the 3 pH indicators

• Phenolphthalein

• Litmus

• Hague Blue

• Methyl orange

What colours do we see with phenolphthalein?

• red - orange

• colourless - pink

• red - orange - green - blue

• red - blue

What colours do we see with methyl orange?

• red - orange

• colourless - pink

• red - orange - green - blue

• red - blue

What colours do we see with litmus paper?

• red - orange

• colourless - pink

• red - orange - green - blue

• red - blue

Which of the following indicators changes from colourless to pink in a basic solution?

• Methyl orange

• Bromothymol blue

• Phenolphthalein

• Litmus

Which indicator turns pink in a basic solution?

• Methyl orange

• Phenolphthalein

• Litmus

• Bromothymol blue

Which of the following is a limitation of pH indicators?

• They are expensive

• They can only be used in solid form

• They provide an exact pH value

• They may not work well in strongly coloured solutions

Pheolphthalein is an indicator that turns pink in which type of solution?

• Acidic

• Neutral

• Basic

• Saline

Which of the following pH numbers indicate a strong alkali (base)?

• 1

• 5

• 7

• 14

• none are correct

What colours do we see with universal indicator?

• red - orange

• colourless - pink

• red - orange - green - blue

• red - blue