INDICATORS AND NEUTRALISATION

Which pH could belong to a strong acid?

• 14

• 8

• 5

• 1

Which ion do all acids contain?

• Cl^-

• OH^-

• H⁺

• Na⁺

When acids and alkalis react, salts of neutral pH are formed.

• True

• False

What are the two products of a neutralisation reaction?

• Acid

• Alkali

• Salt

• Water

What is an indicator in Chemistry?

• Chemical dyes that can change colour according to pH

• A small light bulb on a car

• A chemical involved in a chemical reaction

• A substance used to neutralise an acid

Which ion do all alkalis contain?

• Cl^-

• OH^-

• H⁺

• Na⁺

hydrochloric acid

• HCl

• HClO

• H₃ClO₃

• HClO₃

If a filter paper is dipped in a solution 'A' and then dipped in lime water, the paper turned red in colour, what do you think should be solution 'A'?

• Phenolphthalein

• Turmeric

• China rose solution

• Dye stuff

When you place blue litmus paper into an unknown clear solution, the blue litmus paper turns red.

Which of the following represents the most logical conclusion?

• The substance has a pH value of "2".

• The substance is a base.

• The substance has a pH value of "7".

• The substance is acidic.

Phenolphthalein changes colour to ___________ in an alkaline.

• Colourless

• Blue

• Pink

• Yellow