Household pH Post-Lab

What is the purpose of using indicators in the laboratory experiment described?

• To measure the temperature of substances

• To test for the presence of acids or bases

• To determine the weight of substances

• To identify the color of substances

Which materials are used to test the acid-base properties of substances in the experiment?

• Thermometer and scale

• Beaker and flask

• Litmus paper and phenolphthalein solution

• Bunsen burner and test tube

What should you do after placing one drop on a strip of red litmus paper?

• Stir the solution vigorously

• Watch for any color change and write it down

• Heat the strip over a flame

• Discard the strip immediately

What is the role of a universal indicator in the experiment?

• To weigh the substances accurately

• To provide a heat source

• To indicate the color change of a solution

• To measure the volume of a liquid

What kind of an ion does an acid form in solution?

• Hydroxide ion

• Hydrogen ion

• Sodium ion

• Chloride ion

Tags

NGSS.HS-PS1-3

What kind of an ion does a base form in solution?

• Hydrogen ion

• Hydroxide ion

• Sodium ion

• Chloride ion

What pH values are considered acidic?

• pH 7

• pH 8-14

• pH 0-6

• pH 6-8

What pH values are considered basic?

• pH 0-6

• pH 7

• pH 8-14

• pH 6-8

Can universal indicator be used to determine the strength of acids and bases?

• Yes, it provides a specific pH value.

• No, it only shows if a solution is acidic or basic.

• Yes, but only for strong acids and bases.

• No, it is not reliable for any solutions.

What color is phenolphthalein in acids? In bases?

• Colorless in acids, pink in bases.

• Pink in acids, colorless in bases.

• Red in acids, blue in bases.

• Blue in acids, red in bases.