Acids & Bases

Pure water has a pH of 7. Pure water _______.

• is a base
• is a neutral substance
• could be either an acid or a base
• is an acid

Many cleaning solutions are bases. Which of the following is a property of most bases?

• feels slippery
• white color
• can only be liquid
• tastes sour

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

Which of the following statements is correct?

• Blue litmus paper turns red when placed in a base.
• Red litmus paper turns blue when placed in a base.
• Blue litmus paper stays blue when placed in an acid.
• Red litmus paper stays red when placed in a base.

Which is the stronger acid?

• pH 1
• pH 4
• pH 8
• pH 13

In a base phenolphthalein will give what color?

• Green
• Blue
• Pink
• Clear

Turns litmus blue.

• Acids
• Bases
• Salts
• All

Turns litmus red

• Acids
• Bases
• All

Which has a pH above 7?

• Acid
• Base

Which has a pH below 7?

• Acid
• Base