Kinetics - analysis Starter…

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Kinetics - analysis Starter… Ethyl ethanoate reacts with water to form ethanoic acid and Ethanol. Draw a symbol equation Determine the number of proton environments and intensities for each compound. Sketch a low-res nmr Sketch a high-res nmr Review question maybe using a mind map on a white board

3 3:2:3 1:4:3

2 3:1 1:1

3 3:2:1 3:4:1

5 week plan single lessons Week 1 – Measuring rates and orders Week 2 – Initial rates method Week 3 – Rate equation Week 4 – Review of papers Week 5 – Rates CPAC If you miss a session you MUST download the PowerPoint from the shared area and collect associated materials, this is your responsibility. You must complete all homeworks or you will not be allowed onto Y13 chemistry. No excuses

Task Your task is to confirm that the reaction is first order with respect to H2O2 by using one of two methods. Method 1 Set up the experiment as shown by your teacher. Place 5cm3 of 0.98M H2O2 into the flask and connect the collection hose. Add a small amount of MnO2 catalyst ensuring that the stopper is replaced quickly. Time how long it takes for 50cm3 of O2 to be collected. Repeat with 1.96M, 2.94M and 3.96M Method 2 Set up the experiment as shown by your teacher. Place 5cm3 of 0.98M H2O2 into the flask and connect the collection hose. Add a small amount of MnO2 catalyst ensuring that the stopper is replaced quickly. Record the volume of O2 every 10s until 50cm3 is collected Repeat 2x more.

Tables Your task is to confirm that the reaction is first order with respect to H2O2 by using one of two methods. Method 1 Time (s) vol O2 (cm3) [H2O2] (mol dm-3) Rate ([H2O2] s-1) 10 20 30 40 50 [H2O2] (mol dm-3) Time (s) rate (s-1) 0.98 1.96 2.94 3.92

Processing Use the excel file to process your results. Method 1 Plot a graph of time vs concentration. Use the half life method to calculate the order. Calculate 1/t to get the rate. Plot concentration vs rate. Use the shape to determine the order. Method 2 Plot a graph of time vs concentration. Use the half life method to calculate the order. Calculate the gradient every 10 seconds Plot concentration vs rate. Use the shape to determine the order.

What order is the reaction overall? Hydration of ethyl ethanoate CH3COOCH2CH3 + H2O ⇌ CH3COOH + CH3CH2OH or C4H8O2 + H2O ⇌ C2H4O2 + C2H6O What order is the reaction overall? What method would we use?

Rate equation Consider the reaction aA + bB  products

Rate equation If we know the initial concentration and the initial rate… we can work out k.

Order determination Your task is to determine the overall order of reaction for the forwards and reverse reaction and then write the rate equation for both reactions

Order determination C4H8O2 + H2O ⇌ C2H4O2 + C2H6O Forwards r = k [C4H8O2]2 [H2O]0 Backwards r = k [C2H4O2]1 [C2H6O]1