Acid and Bases

Ammonia is a common base used in household cleaning products. What color will litmus paper turn when placed in a solution of ammonia?

• blue
• yellow
• green
• red

Based on its pH level, which of the following is an acid?

•  sea water, pH=8.25
• detergent, pH=10
• milk, pH=6.5
• human saliva, pH=7

 Distilled water has a pH of 7. According to the pH scale, it is classified as_____________.

• base
• neutral
• an acid
• a solution

Which will form hydroxide ions in solution?

• a base
• an acid
• an alloy
• a neutral substance

Explain what happens when a strong acid and a strong base are poured into the same container.

• They form separate layers.
• They mix physically but not chemically.
• They break apart into separate elements.
• They react chemically to form a salt.

Any substance that produces hydroxide ions in water is known as _______________.

• an acid
• a hydrogen ion
• a base
• a neutral

If vinegar and lemon juice are weak acids, what do you think is generally true about the taste of acidic foods? They taste__________.

• bitter
• sweet
• sour
• salty

Alkalis have a high pH. Which of the terms best describes an alkali?

• an acid
• a base
• a neutral substance
• a polymer

If the pH of a substance is 12.4, that substance would be a ____________.

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

Which of the following substances is the strongest acid?

• soda, pH 3
• tomatoes, pH 4.5
•  stomach acid, pH 2
• coffee, pH 5