Chemistry Acid and Base

Four substances were tested for pH: lemon juice (pH 2), baking soda (pH 9), bleach (pH 12), and milk (pH 6). Rank these 4 substances from most basic to most 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

Is HNO₃ an acid or base?

• Acid

• Base

An unknown substance was tested and found to have an extremely high concentration of hydroxide ions, OH^-. and very low concentration of hydronium ions, H₃O⁺. Which pH would make the most sense?

• pH = 2

• pH = 6

• pH = 8

• pH = 12

Equal amounts of an acid and a base are mixed in a beaker. When neutralization is complete, what is in the beaker besides salt?

• acid only

• base only

• water

What does pH measure?

• strength of an acid

• strength of a base

• strength of both acids and bases

• concentration of H+ ions

As the pH of a solution gets lower, the solution becomes more _____.

• acidic

• basic (or alkaline)

• neutral

• ionic

Which terms refer to how well an acid or base ionizes in a solution?

• strong or weak

• concentrated or dilute

• neutral or charged

• acid or base

A chemical reaction between an acid and a base, forming a salt and water is known as ____.

• ionization

• concentration

• neutralization

• animation

A sugar solution has a pH of 7. This means the sugar solution is:

• acidic

• basic

• neutral

A wasp sting injects an alkaline substance into your skin. What could you use to neutralize it?

• baking soda (pH = 8)

• vinegar (pH = 2.5)

• water (pH = 7)

Tags

NGSS.MS-PS1-2