The absorbance was read, recorded and repeated at 2-min intervals to each of the nine remaining tubes. This procedure was repeated to every reactant flask containing a different pH level (66 data entries). ... The absorbance however was read on the spectrophotometer at 1-min intervals. ... I have removed this data from figure 4, as it follows no trend. ... Human error cannot be ruled out, there are several factors that could have caused the unpredictable data. ...

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