Acids & Bases

Which of the following statements is true concerning acids and bases?

• acids and bases don't react with each other

• acids mixed with bases neutralize each other

• acids mixed with bases make stronger bases

• acids mixed with bases make stronger acids

Solutions that have more H+ ions than OH- ions are

• acids

• bases

• enzymes

• neutral

Solutions that have more OH– ions than H+ ions are

• acids

• bases

• enzymes

• neutral

A scientist runs tests on an unknown substance. He finds that it is extremely corrosive. It produces H+ ions in solution. And, it has a pH of 1. What type of substance has he identified?

• weak acid

• strong acid

• weak base

• strong base

A substance is found to have the following characteristics:

Very bitter taste

Feels slippery to the touch

Produces OH- ions when dissolved in water

In what category would the substance be classified?

• acid

• base

• enzyme

• fatty acid

What does the pH scale measure?

• the concentration of acids and bases
• the malleability of a metal
• the temperature of the water in a swimming pool
• the amount of phosphorus in a compound

The pH of vinegar is 2.5.  Vinegar is a _____________.

• strong acid
• strong base
• weak base
• weak acid

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

Ranging from 0 to 14, a pH value indicates how acidic or basic a solution is.  Which of these pH values would be a strong acid?

• 2
• 6
• 9
• 13

Litmus paper can tell you if a solution is acidic, neutral or basic by changing color when placed in a solution.  If you test a base with litmus paper, it will turn ____________.

• purple
• red
• blue
• pink