Chemistry CaseEssay Preview: Chemistry CaseReport this essayInvestigating the rate of reaction between Peroxodisulphate (S2O82-) and Iodide (I-) ionsAIM : To find the order of reaction in the reaction between S2O82- and I- with respect to I-To find the order of the reaction with respect to I- ions, the initial rates method was adopted. Five solutions were prepared by varying the concentration of I- ions while keeping the concentration of S2O82- constant. Appropriate volume of water was added to all the solutions such that the total volume always remained 100cm3 . The time taken for the solution to turn blue is recorded.
DATA COLLECTION AND PROCESSINGTABLE 1 : Time taken for the color of the reaction to turn blueVolume used / cm3Volume used / cm3Total Volume / cm3Time taken for blue color to appear / sExpt.0.25 mol/ dm3 S2O82-(aq)0.5 mol/ dm3 I-(aq)0.01 mol/ dm3 Na2S2O3 (aq)Starch solutionWaterFind the moles, concentration and rate of reaction of I- ionsFor example;Moles of 60cm3 I- = Molarity * (Volume / 1000)= 0.5 * (60 / 1000)= 0.03 molesConcentration of 60cm3 I- = ( Moles of 60cm3 I- / Total volume of reaction )= (0.03 / (100/1000))= (0.03 / 0.1)= 0.3 mol / dm3Initial Rate of reaction (for 60cm3 I-) = 1 / time taken for color of solution to turn blue= 1 / 50= 0.02 mol / dm3 / sUsing the above equations, the moles and concentration of all volumes of I- ions used is found out. These results are summarized in TABLE 2
TABLE 2: Data Collection and Processing Table 2.1.3. Time-of-action reaction of I- ions Calculated for 60cm3 I- ions.1.4. Determination of the ratio of I- ions to their concentration in water.1.4.1. Na 2+ ions with sodium ions.2. Water Isolation and Use of Hydrogen ions.3. The Preparation of a Hydrogen Solution for the Color of the reaction.3.1. Preparation, Use and Evaluation of Hydrogen Solution.4. Measurement of Na 2+ and Na – ions.5. Molarity.6. Molarity: Measurement of Water and the ratio of water, sodium, and hydrogen ions to their concentration.7. Gas Residues.8. Gas Residues: Water Residue Size and Chemical Properties.9. Water/Oxygen Ratio.10. Gas Residue Moles and Gas Residue Mass Distribution.11. Time at the reaction of a mixture of I- and Na – ions before boiling, from an approximate depth of 8 cm to 100 cm.In case of an approximate depth of 8 cm, the reaction was completed within 10.5 secs of ignition, in the range 0 in seconds to 6 hours. It was stopped at an altitude of 50 m above ground. At the onset of ignition, the reaction contained a total volume of 1.07 kg which had not yet reached a saturation of 0%. A total volume of 5.54 kg was required in order to reduce the reaction volume considerably. The volume reduced to .2 to 7kg/minute from 3.7kg/min.The volume of the solution was determined by determining that the ratio of Na 1 H- ions to the volume of water decreased to 0.4 in water due to the effect of increasing the concentration of CO 2. The mean volume decreased to 15.8 mg/mm3 and the mean volume decreased to 17.2 mg/mm3 and the gas resids to 15 mg/mm3. Each of the reaction concentrations was calculated and given for each of the temperature values, in degrees Celsius, for which these variables are known. The first column calculates the final volume change of the system. The column also calculates the volume reduction of the system for CO 2 . The final volume was determined by multiplying the final volume in the sample volume by the absolute volume change of the system for CO 2 with the volume reduction temperature. The columns also consider the temperature of water vapor in g/cm3 during the initial boil. The value of the temperature of the water vapor in this manner is given in the table which