Nat 5 - Acids and Bases

Front

What does the pH scale indicate?

Back

The pH scale indicates the hydrogen ion concentration and runs from below 0 to above 14.

Front

What is a neutral solution?

Back

A neutral solution has equal concentrations of H+(aq) and OHˉ(aq) ions.

Front

Why is water considered neutral?

Back

Water is neutral because it dissociates into equal concentrations of hydrogen and hydroxide ions.

Front

What are examples of non-metal oxides

Back

carbon dioxide, sulphur dioxide, nitrogen dioxide

Front

What characterizes acidic solutions?

Back

Acidic solutions have a higher concentration of H+(aq) ions than OHˉ(aq) and have a pH below 7.

Front

What characterizes alkaline solutions?

Back

Alkaline solutions have a higher concentration of OHˉ(aq) ions than H+(aq) ions and have a pH above 7.

Front

What happens when an acidic solution is diluted with water?

Back

Dilution of an acidic solution with water decreases the concentration of H+(aq) and the pH increases towards 7.

Front

What happens when an alkaline solution is diluted with water?

Back

Dilution of an alkaline solution with water decreases the concentration of OHˉ(aq) and the pH decreases towards 7.

Front

What do soluble non-metal oxides form when dissolved in water?

Back

Soluble non-metal oxides dissolve in water forming acidic solutions.

Front

What do soluble metal oxides form when dissolved in water?

Back

Soluble metal oxides dissolve in water to form alkaline solutions