Science Indicator

The pH scale is a range from:

• 1-7
• 0-14
• 1-5
• 1-20

A(n) ______ is a substance with a pH less than 7

• Acid
• Alkaline
• Base
• Buffer

What is the only substance with a neutral pH of 7?

• Milk

• Orange Juice

• Pure Water

• Blood

• All Water

In a test of pH levels, a baking soda has a pH of 9 and bleach has a pH of 12. What is true about there relationship?

• Both of the solution are bases

• Both of the solution are acids

• The Baking soda is an acid and the Bleach is a base

• The baking soda is a base and the Bleach is an acid.

A(n) _______ is a substance with a pH greater than 7.

• Base
• Acid
• Buffer
• Water

Litmus paper is an indicator of acids and bases, it turns red for bases.

• True
• false

Bases will turn litmus paper __________, while acids will turn litmus paper __________.

• blue.....red
• red.....blue
• pink.........colourless
• colourless..........pink

An indicator will ______________ when it is in contact with an acid or base

• Bubble
• Form a new substance
• Change color
• Stay the same color

What color does litmus paper turn in the presence of an acid?

• Red
• Blue

Which solution can turn phenolphthalein pink?

• NaOH_(aq)

• CH₃COOH_(aq)

• CH₂OH_(aq)

• HCl_(aq)