ACIDS AND ALKALIS

Acids are alkalis are chemical ______________

• opposites

• equal

Litmus is a dye made from a living organism. It is red in an acid, it is blue in an alkali and it is purple in a neutral solution. What the correct scientific term for a substance that changes colour in this way?

• Acidic

• Indicator

• pH scale

What colour is blue litmus paper in a solution of pH4?

• Red

• Blue

• Orange

• Purple

Acids have a _______________ taste

Acids react with bases forming a __________ and water.

Alkalis feel__________

Tick the household products on this list that are alkalis.

• lemon juice

• soap

• vinegar

• tomato sauce

• vitamin C

The pH ______ shows how acidic or alkaline a solution is.

Which of these solutions are acidic?

• pH 7

• pH 13

• pH 8

• pH 2

Universal indicator can be used to find the ___________ of a solution.