Acids and Bases

Observe the chart below. Which substance is likely an acid?

• Substance A

• Substance B

• Substance C

• Substance D

Tags

NGSS.MS-PS1-2

According to the pH range which substance is more acidic than cabbage juice?

• lemon juice

• lye

• milk of magnesia

Tags

NGSS.MS-PS1-2

Which statement about bases is incorrect?

• Bases turn red litmus paper blue

• Bases contain hydrogen ions

• Bases taste bitter

• Bases have a pH 7.1-14.0

The label on a bottle indicates that the substance inside has a pH of 13. Which of the following statements is an accurate description of the substance?

• It has a large concentration of Hydrogen ions

• It has a large concentration of Hydroxide ions

• It has a small concentration of Hydroxide ions

• It has no ions at all

Litmus paper is made from water-soluble dyes which are extracted from lichens. This paper is used as an acid-base indicator. Which of these common household substances would turn blue litmus paper red?

• Bleach

• Lye

• Ammonia

• Vinegar

Which statement is true of an aqueous solution of KOH?

• It's a base

• It's an acid

• It's neutral

Milk of magnesia is a common ingredient in many heartburn and stomach medications. How does milk of magnesia act to calm and upset stomach?

• Milk of magnesia is an acid that neutralizes stomach acid

• Milk of magnesia is a base that neutralizes stomach acid

• Milk of magnesia has a neutral nature which dilutes stomach acid.

• Milk of magnesia is a base that neutralizes bases in the stomach.

Linda tests an unknown solution in science class. She observes that the solution does not change the color of red or blue litmus paper. She further observes that the pH of the solution is 7.0. Which of the following statements best describes the unknown solution?

• It's a base

• It's an acid

• It's neutral

• It's contaminated

Acids form​ (a)   when mixed with water, and they taste ​ (b)   .

Bases form ​ (c)   when mixed with water, and they taste ​ (d)   .

• H+

• sour

• OH-

• bitter

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

Tags

NGSS.HS-LS1-3