DP Chemistry (last assessment 2024)

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Question 19M.2.hl.TZ2.a(i)

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.2.hl.TZ2.a(i)
Level hl Paper 2 Time zone TZ2
Command term Distinguish Question number a(i) Adapted from N/A
a(i).
[Maximum mark: 1]
19M.2.hl.TZ2.a(i)

Carbonated water is produced when carbon dioxide is dissolved in water under pressure. The following equilibria are established.

Equilibrium (1)  CO2 (g)  CO2 (aq)

Equilibrium (2)  CO2 (aq) + H2O (l) H+ (aq) + HCO3− (aq)

Carbon dioxide acts as a weak acid.

Distinguish between a weak and strong acid.

Weak acid: 

Strong acid: 

[1]

Markscheme

Weak acid: partially dissociated/ionized «in aqueous solution/water»
AND
Strong acid: «assumed to be almost» completely/100 % dissociated/ionized «in aqueous solution/water»    [✔]

Examiners report

As expected, many candidates were able to distinguish between strong and weak acids; some candidates referred to “dissolve” rather than dissociate.

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