Acid Revision

What is the color of litmus in acidic conditions?

• Blue

• Red

• Green

• Yellow

What is magnesium hydroxide commonly used for?

• To make skeletons

• As an indigestion remedy

• To store in containers with hazard warning signs

• As a concentrated solution in industry

What is the pH value of a neutral solution?

• 0

• 7

• 14

• 10

Which pH value range indicates a strong acid?

• pH 12-14

• pH 9-11

• pH 3-5

• pH 0-2

What is the pH range for a strong alkali?

• pH 0-2

• pH 3-5

• pH 9-11

• pH 12-14

What ions do acids release when they dissolve in water?

• Hydroxide ions (OH-)

• Sodium ions (Na+)

• Hydrogen ions (H+)

• Chloride ions (Cl-)

What is the difference between a base and an alkali?

• A base releases H+ ions, an alkali absorbs H+ ions.

• A base is insoluble in water, an alkali is soluble in water.

• A base is soluble in water, an alkali is insoluble in water.

• A base absorbs OH- ions, an alkali releases OH- ions.

What is the result of a neutralisation reaction between an acid and an alkali?

• Salt only

• Water only

• Salt and water

• Salt and hydrogen gas

What is the ionic equation for the neutralisation reaction between any acid and any alkali?

• Na+ (aq) + Cl- (aq) → NaCl (s)

• H+ (aq) + OH- (aq) → H2O (l)

• HCl (aq) + NaOH (aq) → NaCl (aq) + H2O (l)

• H2 (g) + O2 (g) → H2O (l)

Which ions are responsible for the alkalinity of a solution?

• Hydrogen ions (H+)

• Sodium ions (Na+)

• Hydroxide ions (OH-)

• Chloride ions (Cl-)