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# Investigating an equation .

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Introduction

]Aim To investigate the rate equation of Apparatus burettes Pipettes Conical flask Distilled water 0.4 mol dmsodium thiosulphate 2.0 mol dm Hydrochloric acid paper Stop clock Diagram Method To determine the order of reaction of each reactant , I will keep one reactant in excess while changing the concentration of the other . I will place a conical flask on top of a sheet of white paper with a black cross of ink in the centre . The reactants will then be added to the flask ( see table below ). A total of 70 cm of reactants will be used each time (50 cm of Sodium thiosulphate and 20 cm of HCl ) ...read more.

Middle

takes for the sulphur precipite to make the solution opaque therefore being unable to see the cross look from directly above . When this happens I will stop the clock and record the result . For each concentration repeat three times . Minimising , error and anomalous results Before using glass equipment I will rinse it with freshly distilled water and then dry it as well as possible . To make up the different concentrations required ( see table ) I will add distilled water to a sample of the given concentrations . The precipite may stain the flask , to minimise the effect of this I will rinse the flask after each run . ...read more.

Conclusion

Results Concentration of sodium thiosulphate mol dm ( 50 cm ) Concentration of HCl mol dm ( 2O cm ) Time ( seconds ) 1st exp Time ( seconds) 2nd exp Time ( seconds ) 3 rd Mean time (seconds) 0.4 2 28.41 30.22 31.19 29.94 0.3 2 44.66 45.37 45.21 45.08 0.2 2 55.88 53.59 62.18 57.22 0.1 2 88.13 89.72 90.35 89.40 0.05 2 104.40 120.51 122.61 115.84 0.4 1 60.32 61.93 57.21 59.82 0.4 0.5 90.40 89.27 88.62 89.43 0.4 0.250 120.32 119.07 121.78 120.39 0.4 0.125 150.66 147.98 147.52 148.72 Analysis As both graphs have constant half-lifes they are both first order . This makes the overall reaction second order Evaluation Source of error unclean equipment starting the clock Degree of cloudiness measurements from instruments mixing solution experimental improvements colorimeter light sensor The determination of a rate equation Assessed Practical ...read more.

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