A-LevelChemistryReaction kineticsOct/Nov 2023Paper 5 Q216 Marks
A student investigates the rate of reaction when zinc reacts with dilute hydrochloric acid, HCl(aq). Zn(s) + 2HCl(aq) → ZnCl₂(aq) + H₂(g) The student uses the following method. Step 1 Accurately weigh 1.00 g of zinc foil. Step 2 Add 50 cm³ of 2.00 moldm⁻³ HCl(aq) to a conical flask. Step 3 Add the zinc foil to the 50cm³ of HCl(aq) in the flask and immediately start a timer. Step 4 Stop the timer when 20.0cm³ of H₂(g) has been collected. Step 5 Repeat Steps 1 to 4 using lower concentrations of HCl(aq).
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