Strength of Acids and Alkalis

Phenolphthalein indicator, when mixed with an acidic liquid, is (a)   in appearance.

Match the following pH to the type and strength of solution

• Strong Alkali

• pH 5

• Strong Acid

• pH 10

• Weak Alkali

• pH 14

• Weak Acid

• pH 1

Match the following names to the correct formulas:

• HNO₃

• Sodium Hydroxide

• NaOH

• Nitric Acid

• H₂SO₄

• Sulphuric Acid

• ZnO

• Zinc Oxide

• HCl

• Hydrochloric Acid

Tags

NGSS.MS-PS1-5

Match the following colours to pH values, using Universal Indicator:

• pH 1

• Green

• pH 10

• Blue

• pH 3

• Yellow

• pH 14

• Red

• pH 7

• Purple

Select the correct statement.

• A strong acid completely ionises in water.

• A weak acid completely ionises in water.

• A strong acid partially ionises in water.

• A weak acid partially ionises in water.

Tags

NGSS.MS-PS1-2

Select the correct statement.

• Reactions with strong acids are irreversible.

• Reactions with strong acids are reversible.

• Reactions with weak acids are irreversible.

• Reactions with weak acids are not reversible.

Tags

NGSS.MS-PS1-2

Coffee has a pH of about 4. Select the best conclusion.

• Coffee is an acid.

• Coffee is an alkali.

• Coffee is a weak acid.

• Coffee is a medium-strength acid.

Select the correct conclusion.

• Concentrated acids have a large number of dissolved acid particles per unit.

• Concentrated acids have a small number of dissolved acid particles per unit.

• Dilute acids have a large number of dissolved acid particles per unit.

• Dilute acids have a small number of dissolved alkali particles per unit.

Tags

NGSS.MS-PS1-5

An (a)   is a soluble base.

Mr. Leach has been stuing by a wasp. The pH of the wasp sting is pH6. Suggest the pH Mr. leach needs to neutralise the sting.

• 7

• 8

• 9

• 10