8. Acids

High pH values show solutions are:

• Strongly acidic

• Strongly alkaline

• Neutral

• Weakly acidic

pH measures:

• The colour of a solution.

• The concentration of H⁺ and/or OH^- ions in a solution.

• The dissociation of an acid.

• The concentration of an acid.

A high concentration of H⁺ ions in solution will give:

• A high pH.

• A low pH.

• A negative pH.

• A medium pH.

A base is:

• A soluble alkali.

• Something containing H⁺.

• Something containing OH^-.

• A substance that reacts with an acid to form salt and water only.

Weak acids...

• ... partially dissociate in solution.

• ... fully dissociate in solution.

• ... partially move in solution.

• ... fully move in solution.

Preparation of which kind of salt features filtration?

• Insoluble

• Soluble

• Both soluble and insoluble

• Neither soluble or insoluble

Preparation of which kind of salt features crystallisation?

• Soluble

• Insoluble

• Both soluble and insoluble

• Neither soluble or insoluble

Acid + Base $\rightarrow$   

• Salt + Water

• Salt + Hydrogen

• Salt + Water + Carbon Dioxide

• Salt only

Acid + Metal $\rightarrow$   

• Salt + Water

• Salt + Hydrogen

• Salt + Water + Carbon dioxide

• Salt only

How do you test for the presence of hydrogen gas?

• See if a glowing splint relights

• See if a lit splint burns with a squeaky pop

• See if a lit splint goes out

• See if bubbling the gas through limewater turns the limewater cloudy