with emperature we can determine the activation energy, E, for the reaction by m

Question

with emperature we can determine the activation energy, E, for the reaction by making use of the A In this equation, k is the rate constant at the Kelvin temperature T E,is the activation energy, and Ris the gas constant. By plotting In k against IT we should obtain, by Equation 4, a straight line whose slope equals E/R. From the slope of that line we can easily calculate the activation energy. WEAR YOUR SAFETY GLASSES WhILE PERFORMING THIS EXPERMENT Experimental Procedure A. Dependence of Reaction Rate on concentration In Table 21.1 we have s the reagent volumes to be used in carrying out the several reactions whose rates we need to know to find the general rate law for Reaction 1. First, measure out 100 mL ofeach of the listed reagents (except H,0) into clean, labeled flasks or beakers. Use these reagentsin your reaction Table 21.1 Reaction Flask 1250 ml) Reaction Flask ma25 ml) 0.010 M KI 0.0010 M Nais,o, Hao 0.040 M KBro, 0.10 M HCI The actual procedure for each reaction mixture will be much the same, and we will describe it now for Reaction Mixture 1 Since there are several reagents to mix, and since we don't want the reaction to start until we are ready. will put some of the reagents into ooe flask and the rest into another, selecting them so that no reaction occurs until the contents of the two flasks are mixed. Using a 10-mL graduated cylinder to measure vol- measure out 10 mL 0.010 M KI, 10 ml 0.0010 M Na,sro, and 10 mL distilled water into a 250-mL Erlenmeyer flask (Reaction Flask I). Then measure out 10 mL 0.040 M KBro, and 10 ml. 0.10 M HCI into a 125 ml. Balenmeyer flask (Reaction Flask II). To Flask add three or four drops of starch indicator solu- Pour the contents of Reaction Flask II into and swirl the solutions to mix them thor- oughly. Note the time at which the solutions were mixed. Continue swirling the solution. It should tum blue in less than 2 minutes. Note the time at the instant that the blue color appears Record the temperature of the blue solution to 0.2'C. Repeat the procedure with the other mixtures in Table 21.1. Don't forget to add the indicator before mixing the solutions in the two flasks. The reaction flasks should be rinsed with distilled water between runs When measuring out reagents, rinse the graduated cylinder with distilled water after you have added the reagents to Reaction Flask 1, and before you measure out the reagents for Reaction Flask ll. Try to keep the temperature just about the same in all the runs. Repeat any experiments that did not appear to proceed

Explanation / Answer

BrO3- (V1) 0.04 M2 10 0.008 10 0.008 20 0.016 10 0.008 5 0.004 Now, applying M1V1 = M2 V2 Here, M 1 = 0.040 V1 = as shown above M2 = x V2 = 50 I- (V1) 0.01 M2 10 0.002 20 0.004 10 0.002 10 0.002 8 0.0016 Now, applying M1V1 = M2 V2 Here, M 1 = 0.010 V1 = as shown above M2 = x V2 = 50 H+ 0.1 10 0.02 10 0.02 10 0.02 20 0.04 15 0.03

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.