CHEM 102 Fall 2017 Lab 9-Bromination of Acetone A+B+C Products 2. For the reacti
ID: 590857 • Letter: C
Question
CHEM 102 Fall 2017 Lab 9-Bromination of Acetone A+B+C Products 2. For the reaction in problem 1, if the concentrations of reactants A and B are kept constant while that of C is doubled, what will happen to the value of the following: a. Rate of the reaction will: decrease, stay the same, or increase (circle one). Explain: b. Reaction order of reactant C will: decrease, stay the same, or increase (circle one). Rate constant will: decrease, stay the same, or increase (circle one). Explain: c. 3. A student mixes 10.00 ml. of 0.02 M Bri, 10.00 ml of 4.0 M acetone, and 5.00 mL of 4.0 M HCL Calculate the concentration of Brz in the mixture. Calculate the concentration of acetone in the mixture. Please show your work. (Assume no reaction happens. This will be your initial concentrations of the reaction mixture.) I. Observing the Reaction: Dispense 5.0 ml. of 4.0 M acetone and 5.0 mL of 4.0 M HCI into one beaker. Add 10 mL of deionized water (use dispenser). Add 5.0 ml of 0.020 M Br and swirl to mix. Observe for at least 5 minutes. Record your observations ellow Rist, became clear4mn, SSse II. Equipment setup for colorimeter Plug the colorimeter into the laptop. Launch the Capstone software program. Click on the option to display a graph and two digit displays. Click on the "select measurement" tab along the y-axis on the graph. Select "Blue (468 nm) Absorbance". Similarly select "Blue (468 nm) Absorbance" on one of the digit displays. a. b. Clean, rinse, and fill with deionized water one of the cuvettes that come with the colorimeter. Insert the cuvette into the colorimeter. Click the "record" button near the bottom of the computer display. Press the green button on the colorimeter. After the green light turns off your colorimeter is calibrated, and the digit display should read 0.000. Do not touch the green button again. Click on the "stop" button near the bottom of the computer display (where the record button used to be).Explanation / Answer
Given
rate equation is
r = 0.5 [A]2 [C]
so the order of reaction with respect to A is 2, B is 0 and C is 1 the order of the reaction won't change with concentration
and the rate constant for a reaction is also constant as it is independent of the concentration of the reactants
but the rate of the reaction will change with the change in concentration of C as the rate of reaction is directly proportional to the concentration of C
(a) rate of reaction will increase
(b) order of reactant C will remain the same
(c) Rate constant will remain same