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CIM 112 LAB EXERCISE EFFECT OF CONCENTRATION AND TEMPERATURE ON REACTION RATES STUDENT NAME: PART A: EFFECT OF CONCENTRATION ON REACTION RATES PROCEDURE: Liain about 50 ml of oxalic acid solution, about 10 ml of potassium permanganate solution, large test tubes, a stopwatch, a pigs and about 70 mL of distilled water. THIS IS ENOUGH SUPPLIES FOR BOTE PARTS A AND B. RECORD THE MOLARITY OF THE OXALIC ACID SOLUTION, POTASSIUM PERMANGANATE SOLUTION, AND THE ROOM TEMPERATURE ABOVE IN DATA TABLE 1. 2,Using the rubber bulb, pipet 5 mL of the oxalic acid solution into a large test tube. Pipet 6 of water into the oxalic acid solution and thoroughly mix the contents of the test tube by airling. Pe 3.Prepare to begin tining with the stopwatch. You will begin tining when one-half of the potassium permanganate solution has been added. Slowly pipet 1 mL of potassium permanganate solution into the oxalic acid/water solution. Thoroughly mix the reaction mixture by swirling the test tube and contents. Take a piece of paper with a cross drawn on it and place it behind the test tube, when you first see the cross through the reaction mixture, the reaction is over. Record this time in Data Table 1. 4.Clean the large test tube and repeat Steps 2-3 using 10 mL of oxalic acid solution, 1 st of water, and 1 ml of potassium permanganate solution. 5.Repeat Step 4 using 5 at of oxalic acid solution, 5 mL of water, and 2 x of potassium permanganate solution. hranom s.Calculate the concentration of each reactant present in the initial starting mixture noting that the tatal volume of each simple is 11 egaation below and record the concentrations in calculations Table 1. othe MV, MV WHERE 7.Using the equation below, determine the rate for each reaction and record in Calculations Table 1. / THE RATE 8.Using the equation concentration with determine the rate Calculations Table 1. 5ML CO 1 ML O DATA TABLE I [STOCK BOL 3.5mp. 9.Using the rate expression, pick one rate and use the concentrations to determine the rate constant, hecord in Calculations Table 1. STOCK SOLUTIONS CONCENTRATION: OXALIC ACID below and the changes in respect to changes in cate expression and record in TIME (SECO DATA TABLE I RATE= []" [" POTASSION PERMANGANATE ROOM TEMPERATURE STOCK SOLUTIONS CONCENTRATION OXALIC ACID POTASSION PERMANGANATE ROOM TEMPERATURE

STOCK SOLUTIONS CONCENTRATION: ORALIC ACTR DATA TABLE I ISTOCK BOL.1 5 mL H.C.O. KO 9.Using the rate expression, pick sne sate and are the concentrations to determine the rate constant, Record in calculations Table 1. DATA TABLE I ISTOCK SOL STOCK SOLUTIONS CONCENTRATION OXALIC ACID 5 ml 1₂₂0. 1 m K ML water 10 CO 1 Q 1 of matse 5 5 B.C.O. FOOD MALE CALCULATIONS TABLE 1 water [BTOCK SOL. [OKALIC ACID) 5 ML RUCO 2 m 6 10 m ₂ 1 Bhatar 3 CO POTASSIM PERMANGANATE BOOM TEMPERATURE TIME CORCES 5 mL N.C.O. 1 L KO 6 water 10 MLB.CO 1mk KMnQ. 1 l water POTASSIUM PERMANGANATE BOOM TEMPERATURE: TIME (RECY stellunge DEPORMALAL Update Tokep up-to-date with security updates, tives, and improvements, the CALCULATIONS TABLE 1 [STOCK SOL.] [OXALIC ACID) 100.1 4 4 5₂0₂0. 2 KMQ 5. Water RATE EXPRESSION FOR THE REACTION MATE RATE CONSTANT FOR THE REACTION FART BEFFECT OF TEMPERATURE ON REACTION RATES Check for Updat PROCEDURE: Ersats water bath by filling a 600 a beaker half full of water. Place the beaker as a vice passe o a tripod or ring stand. 2.1nto each of two large test tubes, sitte

****CEL FANCY FOR DRVire gause on a tripod or ring stand. 2.Into each of two large test tabes, pipette 5 ni of oxalic acid, and 6 of water. 3. Inte each of the two additional test tubes, pipette 1 ml of potassium permanganate. 4.Place all the test tubes and their contents in the Water harh sinna. was besar bast the MALA 1 sl of potassium permanganate. 4.Place all the test tubes and their contents in the water bath. einga husen burner, beat the water and test tubes ta 10 EC above room temperature. 5.Mix the contents of one of the test tubes containing oxalic acid and water with one of the test tubes containing the potassium permanganate solution. Record the time it takes for the reaction to to completion using the paper with the cross in Data Table 11. 6.Using four large, cless test tubes, repeat Stape 2 and 3. 7.Remove the Bunsen burner and add enough Low to lover the temperature to 108C below room temperatale. the temperature reaches 10EC below room temperature, repeat Step 5 and record the time in Data Table 11. 8.Record the information from the first reaction of Part A ISTERS 2 AND 21 Data Table 11 as the room temperature data. DATA TABLE 11 AT BOOM TEMPERATURE 108 ABOVE BOOK TEMPERATURE 10EC BELOW BOOK TEMPERATURE VANT EL GONITIONE 1.How did the potassium permanganate chemically reaction with the alle acid DATA TABLE 11 AT ROOM TEMPERATURE 1000 ABOVE ROOM TEMPERATURE TOPERATURE, BO 10EC BELOW NOOM TEMPERATURE TEMPERATURE, Ec TIME COND PART CE QUESTIONS 1.How did the potassium permanganate chemically reaction with the oxalic acid? 2.Why did we keep the total concentration in Part A constant? 3.What was the overall order of the oxalic acid and potassium permanganate reaction? 4.What was the effect of changing concentrations on the reaction zate? 5.What was the effect of changing temperature on the reaction rate?