Acids and Bases

Which of the following is most likely to be basic:

• Lemon juice

• Vinegar

• Laundry detergent

• Coke

Why are bases useful as cleaning products?

• They dissolve fats and oils

• they are corrosive, so they eat anything

• they don't mix with water

• since bases are slippery, they slip dirt off of surfaces

Human blood has a pH between 7.35 and 7.45. Which of the following best describes human blood?

• strongly acidic

• slightly acidic

• strongly basic

• slightly basic

Tags

NGSS.HS-LS1-3

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

• blue.....red

• red.....blue

• pink.........colourless

• colourless..........pink

Four substances were tested for pH, lemon juice (pH 2), baking soda (pH 9), bleach (pH 12), and milk (pH 6). Which of the following correctly lists the substances from most basic to acidic?

• lemon juice, milk, baking soda, bleach

• bleach, baking soda, milk, lemon juice

• milk, lemon juice, baking soda, bleach

• baking soda, bleach, lemon juice, milk

Tags

NGSS.MS-PS1-2

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

• Acid

• Alkaline

• Base

• Buffer

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

• Base

• Acid

• Buffer

• Water

A base is a substance

• That releases OH- ions when dissolved in water

• That releases H+ ions when dissolved in water

• Does not release any ions when dissolved in water

• None of the above

An acid

• is a substance that releases H+ ions when dissolved in water

• is a substance that does not release any ions when dissolved in water

• is a substance that releases OH- when dissolved in water

• releases an equal amount of OH- and H+ ions when dissolved in water

Unsweetened cocoa has a bitter taste. It is most likely which of the following?

• acid

• base

• neutral

• salt