Acids, Bases, and Indicators

Which of the following is NOT a property of ACIDS

• tastes sour

• has a pH between 8 and 14

• feels sticky

• reacts with metals

A students tests a substance using red litmus paper and phenolpthalein. The phenolpthalein stayed colorless while the red litmus paper turned violet. What kind of substance was being studied?

• acid solution

• base solution

• neutral solution

• salt solution

Which of the following is an example of a substance that has a neutral pH?

• lemon juice

• water

• lysol

• vinegar

A student is studying a substance that tastes bitter and is slippery to touch. When phenolpthalein is added is turns magenta. What is the student most likely studying?

• water (neutral)

• lemon juice (acid)

• drain cleaner (base)

• salt solution (neutral)

Which of the following is NOT a property of a base?

• when mixed with an acid it becomes neutralized

• slippery to touch

• measures 8-14 on the pH scale

• reacts with metals

a substance is found to turn phenolpthalein magenta (pink). Predict what will happen when blue and red litmus paper is placed into the substance.

• the blue litmus will stay blue and the red litmus will stay red

• the blue litmus will stay blue and the red litmus will turn blue

• the blue litmus will turn red and the red litmus will stay red

• the blue litmus will turn red and the red litmus will turn blue

a student measures the pH of a substance using pH paper. It turns a dark blue and is determined to have a pH of 13. Which of the following best describes this substance?

• strong base

• strong acid

• weak base

• weak acid

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

Vinegar, fruit juice, and cola are examples of:

• salts

• neutral substances

• bases

• acids

Milk is a very weak acid. What might its pH value be?

• 6.5

• 7.8

• 4.2

• 12.2