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Monitoring and controlling chemical reactions answer explanations

Review worked answers and explanations for Monitoring and controlling chemical reactions. Aligned to OCR Gcse Chemistry A Gateway.

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A student performs a titration to determine the concentration of an unknown solution of potassium carbonate (K₂CO₃). They pipette 25.0 cm³ of the K₂CO₃ solution into a conical flask and titrate it with 0.125 mol/dm³ hydrochloric acid (HCl). The average titre for the HCl is 22.80 cm³. The balanced chemical equation for the reaction is: K₂CO₃(aq) + 2HCl(aq) → 2KCl(aq) + H₂O(l) + CO₂(g) Calculate the concentration of the potassium carbonate solution in mol/dm³. [4 marks]

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