Mikalah Millheim Lab Partner: Ashlin Chavez Exp. G2 November 4, 2015 A. pH vs. mL of NaOH solution The end point of the titration was around 20 mL. After this point the rate of change nearly leveled which indicates that the NaOH (aq) was no longer reacting and being neutralized by the HKC H O (aq). ₈ ₄ ₄ B.
Line of regression: y = 8.876x + .032 Phenolphthalein Bromothymol Blue mass of KHP .5070 .7026 .3000 .6072 moles KHP .002452 .003441 .001469 .002974 Total NaOH 2.60 mL 6.50 mL 8.45 mL 18.9 mL moles NaOH .0156 .039 .0507 .1134 There is a greater contrast in the ratio between the number of moles of KHP (aq) and NaOH (aq) when the reaction was tracked with Phenolphthalein compared to Bromothymol Blue. In either case, when more moles of KHP (aq) were involved in the reaction, more moles of NaOH (aq) were required for neutralization. This trend can be seen in the graph as well as the data table. C.
In all three methods of testing it was observed that the number of moles of NaOH required to neutralize KHP increased as the moles of KHP increased. This was a concept capable of understanding prior to the experiment. When using bromothymol blue, less NaOH was
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