pH Indicators

Which of the following is an example of a substance that has a neutral pH?

• lemon juice

• water

• lysol

• vinegar

A student measures the pH of a substance using pH paper. It turns a dark blue and is determined to have a pH of 13. Which of the following best describes this substance?

• strong base

• strong acid

• weak base

• weak acid

What is the colour of phenolphthalein an acid?

• Pink

• Yellow

• Orange

• Colourless

What is the colour of litmus in an acid ?

• Pink

• Yellow

• Red

• Colourless

What is the colour of litmus in a base ?

• Pink

• Blue

• Red

• Colourless

What is the colour of phenolphthalein in a base ?

• Pink

• Blue

• Red

• Colourless

What is the colour of methyl orange in a base ?

• Pink

• Blue

• Yellow

• Colourless

If NaCl has a pH of 7, what color will it be in Thymol Blue?

• red

• yellow

• green

• blue

If NaOH has a pH of 12, what color will it turn in Thymol Blue?

• red

• yellow

• green

• blue

What solution is being tested based on the following results:

Red litmus turns blue

Blue litmus remains blue

Phenolphtalein turns pink

• NaOH

• HCl

• H₂O

• C₆H₁₂O₆

Tags

NGSS.MS-PS1-2