Practical Chemistry Report Essay Example | Topics and Well Written Essays - 1750 words

Practical chemical science Report - Essay ExampleMolar absorptivity is fixed the moment the reactant is fixed, cell length is exchangeable and therefore, its effect is also fixed. Now only variable deciding intensity of the absorbed and therefore transmit light is the concentration of the reactant. Therefore, concentration of the reactant at a particular time can be involve directly from the detector reading of the transmitted light. Care should be taken to subtract the reading agree to the bare solution i.e. the solution having no reactant.Data from both the experiments has been darnted separately on outfit log scale i.e. lnA was plotted against time t (s) using excel software. Data points were plotted as a X-Y scatter plot and a linear interpolation was used as nature of the plot for the first redact reaction is linear from the theory. Slope of the line gives value of the rate constant and the interrupt gives value of the initial concentration i.e. AoFigure 1 shows variat ion of lnA vs time for Experiment 1. The close law of proximity of the data points from the linear interpolation line confirms that all the data points are very accurate. The same is confirm by very high value of R2 which is 0.9929. One should note that value of R2 being 1 path all the data points will fall on the interpolation line. That is the ideal condition which never happens in actual experiments.There is another useful parameter half bread and butter (t1/2) associated with a first order reaction kinetics. This is the tie period during which concentration of the reactant is reduced to half of its original value. Value of half life (t1/2) can be calculated by putting A = Ao/2 and setting t as t1/2 in the integrated form of the rate equation derived above. This comes out to beIn experiment 1 value of the rate constant () is 0.0006. Therefore, value of half life comes to be 1155 second. One should check in the experimental data whether really A is halving in every 1155s. What we find is that