DP Chemistry (last assessment 2024)

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

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

Soda water has sodium hydrogencarbonate, NaHCO3, dissolved in the carbonated water.

Identify the type of bonding in sodium hydrogencarbonate.

Between sodium and hydrogencarbonate:

Between hydrogen and oxygen in hydrogencarbonate:

[2]

Markscheme

Between sodium and hydrogencarbonate:
ionic    [✔]

Between hydrogen and oxygen in hydrogencarbonate:
«polar» covalent     [✔]

Examiners report

This was an easy question, especially the identification of the type of bond between H and O, yet some candidates interpreted that the question referred to intermolecular bonding.

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