6.3

Which of the following is a weak acid?

• HCl

• HNO₃

• H₂SO₄

• CH₃COOH

This question may contain more than one answer.

• Ethanoic acid is a stronger acid compared to hydrochloric acid.

• Concentration of hydrogen ions is higher in hydrochloric acid compared with ethanoic acid.

• The degree of dissociation of hydrochloric acid in water is lower than ethanoic acid.

• Both acids can neutralized an alkali to produce salt and hydrogen gas

Which of the following solutions has the highest concentration of hydrogen ions?

• 50 cm³ of 2 mol dm^-3 hydrochloric acid

• 50 cm³ of 2 mol dm^-3 ethanoic acid

• 50 cm³ of 2 mol dm^-3 nitric acid

• 50 cm³ of 2 mol dm^-3 sulphuric acid

Which of the following statements correctly describe a strong acid? * can click more than 1 answer.

• Has a high pH value

• Ionizes completely in water

• Has a high concentration of hydrogen ions

• Exists as molecules in water

Which of the following is true of a weak acid?

• Unable to neutralize alkali

• The pH value is more than 7

• Able to change red litmus paper to blue

• Ionizes partially in water to produce low concentration of hydrogen ions

Why ammonia solution is a weak alkali?

• It has high pH value

• It dissociates partially in water

• It contains a lot of ammonium ions

• It produces low concentration of hydrogen ions in the water

Which of the following shows the process of dissociation in a strong alkali when it is added to water? The letters X and Y are not actual symbol of the elements.

• 
• 
• 
• 

Which of the following is a weak alkali?

• Lithium hydroxide

• Cooper(II) hydroxide

• Aqueous ammonia

• Potassium hydroxide

Two different acids have pH values 1 and 4 respectively. The difference in the pH values is due to the

• different degree of ionisation

• different concentrations

• different acidic properties

• different electrical conductivities

Table 1 shows the pH values of four acidic solutions which have the same concentration.

Which acidic solution has the highest degree of dissociation?

• K

• L

• M

• N