Review Acids and Bases

Many common household substances may be classified as acids or bases. According to the pH scale:

• baking soda is a weak base while bleach is a strong base.

• coffee is a weak acid while drain cleaner is a strong acid.

• oven cleaner is a weak acid while battery acid is a strong acid.

• drinking water is a weak base while soapy water is a strong base.

The pH scale runs from 0 to 14, and is an indication of how acidic or basic a solution is. A pH close to zero indicates a(n) _______ solution, and a pH near 14 indicates a(n) _______ solution.

• acidic, basic

• basic, acidic

• neutral, acidic

• neutral, basic

Your mother has an unlabeled bottle of clear liquid in the refrigerator. You ask your mother about it, and she tells you that she bought it at the store for you to drink but the label must have fallen off. You pour a small cup of the liquid and taste it, and it has a distinctly sour flavor. The pH of this liquid is MOST likely

• 0

• 7

• below 7

• above 7

According to the scale, which of these substances is the strongest acid?

• NaOH

• blood

• bleach

• lemon juice

According to the pH chart, which is the strongest base?

• HCl

• Bleach

• NaOH

• saliva

Has a pH less than 7:

• Acid

• Base

• Both acid and base

• Salt

Litmus paper is made from water-soluble dyes which are extracted from lichens. This paper is used as an acid-base indicator. Which of these common household substances would turn blue litmus paper red?

• bleach

• baking soda

• soap

• vinegar

Lemon Juice

Tums (antacid)

Water

Put all of the above household items in order from lowest to highest pH.

• Lemon juice, water, Tums

• Water, Tums, Lemon Juice

• Tums, Water, Lemon Juice

• Lemon Juice, Tums, Water

BOTH acids and bases

• are a component of soap

• have a positive charge when dissolved in water

• conduct electricity

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Oven cleaner is a highly caustic chemical that reacts with baked on foods. It is dangerous to the touch and has a very slippery feel.What is the likely pH of oven cleaner?

• Below 4

• Around 7

• Above 10

• Between 5 and 7