MAI Equilibrium I
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H2(g) + I2(g) ⇌ 2HI(g) I2 is a purple gas, the others are colourless. H2 and I2 mixed in sealed container at constant temperature Describe how the appearance of the gaseous mixture changes until dynamic equilibrium is reached. Explain this observation in terms of the concentration of iodine. (3)
• Intensity of purple decreases as reaction starts • Colour becomes constant once equilibrium is reached • because the concentration of iodine decreases then becomes constant
Explain why it is essential for the reaction to be carried out in a sealed container for equilibrium to be reached (2)
• creates a closed system where no matter can escape • ensures gaseous reactants and products cant escape so their concentrations can reach a constant value