acid base review

Multiple Choice

The pH scale measures...

• ...the strength of an base.

• ...the strength of hydrogen ions.
• ...the concentration of hydrogen ions.
• ...the concentration of an acid

Multiple Choice

A scientist runs tests on an unknown substance. They find that it is extremely corrosive. It produces H⁺ ions in solution, and it has a pH of 1. What type of substance is this?

• weak acid

• strong acid

• weak base

• strong base

Multiple Choice

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

• acidic

• basic

• neutral

Multiple Choice

The pH of a solution is tested, and it is found to be a basic solution. Of the following choices, what could the pH have been?

• 3
• 9
• 7
• 5

Multiple Choice

A substance is found to have the following characteristics:

Very bitter taste

Feels slippery to the touch

Produces OH- ions when dissolved in water

In what category would the substance be classified?

• acid

• base

• neutral

Multiple Select

Choose all that apply.

Which of the following are acids?

• NaOH

• HF

• H₂SO₄

• NaCl

• HC₂H₃O₂

Multiple Choice

According to the pH scale, which item is more acidic than lemons?

• battery

• vinegar

• milk

• blood

Multiple Choice

In order for the acid-metal reaction 2Al + 6 HCl → 2AlCl₃ + 3H₂ to occur, which of the following must be true?

• Al must be above Cl on the activity series.
• Al must be above H₂ on the activity series.

• Heat must be supplied for the reaction.
• A precipitate must be formed.
• H₂ must be above Al on the activity series.

Multiple Choice

In a neutralization reaction, what are the products of a reaction between an acid and a base?

• Another acid and base

• Carbon dioxide and a salt

• Water and a salt

• Either two acids or two bases

• Salt and hydrogen gas

Multiple Choice

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

• baking soda (pH = 8)

• vinegar (pH = 2.5)

• water (pH = 7)

Multiple Choice

Identify the salt in the following equation:

Zn(OH)₂ + HNO₃ → H₂O + Zn(NO₃)₂

• Zn(OH)₂

• HNO₃

• H₂O

• Zn(NO₃)₂

• none of these compounds is a salt

Multiple Choice

If an acid is combined with a base of equal strength, the result will most likely be

• a neutral solution.
• a stronger acid.
• impossible to tell without testing the pH.
• a stronger base

Multiple Select

Choose all that apply.

What would be a useful method to identify Ca(OH)₂ as a base?

• add Mg to produce H₂ ↑

• add NaHCO₃ to produce CO₂ ↑

• add PHTH to see if the solution turns bright pink

• add phenol red to see if the solution turns yellow

Multiple Choice

Which litmus paper shows the presence of an acid?

• top - red paper turns blue

• bottom - blue paper turns red

• neither - they both show neutral solutions

• neither - they both show basic solutions

Multiple Choice

What color will phenolphthalein turn in a base?

• colorless

• blue

• pink

• yellow

• white

Multiple Choice

Phenol red is added to a solution, and the solution turns yellow. What is most likely true?

• the solution is a base, with a pH = 5

• the solution is a base, with a pH = 9

• the solution is an acid, with a pH = 4

• the solution is an acid, with a pH = 10

• the solution is neutral, with a pH ~7

Multiple Choice

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