7. Acids & Bases

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

• 6.5

• 7.8

• 4.2

• 12.2

Stronger acids have a pH closer to...

• 7

• 0

• 14

• 9

Weaker bases have a pH closer to...

• 8

• 0

• 14

• 4

According to the pH scale, which item is more acidic than lemons?

• battery

• vinegar

• milk

• blood

True or false: a neutral solution has equal amounts of H⁺ and OH^-.

• True

• False

The esophagus is the tube that connects the mouth to the stomach. Heartburn occurs when some of the stomach juices flow backwards up the esophagus. To help relieve heartburn, a person should take medicine that is

• neutral
• basic
• 
  acidic or basic.
  
• acidic

Which type of ion does a base produce when it is dissolved in water?

• oxide
• oxygen
• hydrogen
• hydroxide

Which of the following is true about acids and bases?

• The lower the pH, the stronger the acid
• the higher the pH, the stronger the acid
• The lower the pH, the more neutral the acid
• The higher the pH, the weaker the base

An acid HX has a pH value of 1.5. What is the concentration of hydrogen ions, H⁺ in this acid in mol dm^-3?

• 0.032

• 1.500

• 0.049

• 0.015

A solution has 0.0235 mol dm^-3 HCl. Calculate the pH of this solution.

• 12.371

• 1.699

• 1.629

• 15.699