What is the importance of dissolved air in water? Support your answer with equations. [4 marks]

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Solution

Aquatic animals use the dissolved oxygen in water for respiration. [1 mark]

Aquatic plants use dissolved ${CO}_{2}$ for photosynthesis.
$6 {CO}_{2} + 6 H_{2} O \to C_{6} H_{12} O_{6} + 6 {CO}_{2} + Δ$
[1.5 marks]

Marine organism form shells of ${CaCO}_{3}$ from $Ca {({HCO}_{3})}_{2}$ .
${CaCO}_{3} + {CO}_{2} + H_{2} O \to Ca {({HCO}_{3})}_{2}$
[1.5 marks]

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