Acid/Base

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

The table shows the pH of several solutions. Which solution is the most acidic?

• vinegar

• milk

• water

• bleach

Zn(OH)₂ is an example of a...

• acid

• base

• salt

• water

H₃PO₄ is an example of a ...

• acid

• base

• salt

• non-electrolyte

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

At what pH would all three indicators appear as yellow?

• 1.7

• 2.7

• 4.7

• 8.7

Phenolphthalein is pink in an aqueous solution having a pH of

• 2

• 7

• 5

• 12

Based on the results of testing colorless solutions with indicators, which solution is MOST acidic?

• a solution in which bromthymol blue is blue

• a solution in which bromcresol green is blue

• a solution in which phenolphthalein is pink

• a solution in which methyl orange is red

If a solution has a pH of 1.5, then litmus would turn

• red

• purple

• blue

• yellow

If a solution has a pH of 10, then methyl orange would turn

• red

• yellow

• orange

• blue