Prelab 8 AMC.docx - Prelab 8 Determination of the pKa of...

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Prelab 8: Determination of the pKa of Bromocresol Green Introduction There will be two different components of this experiment that we will conduct which is an acid- base titration and a spectrometry. The bromocresol green is a monoprotic acid which will be utilized to give us a linear graph of our pKa. HIn and In - are two dissociated forms of bromocresol green. The HIn is either the pronated or acidic form. The In - is either in the deprotonated or basic form. Due to the fact that bromocresol green has the ability to act as an acid- base indicator we can utilize the spectrophotometer and also the pH meter to determine the pKHln of the five samples that we have in our experiment. To create an accurate graph, we have five beakers that will be used in this experiment that consists of acids or bases such as NaOH or HCl. Our estimated pH values are combined with the readings of the pH meter. The readings give us an idea of what our graphed results should look like. One of the studies I have researched explains how astronomers in London utilize spectroscopy for a different purpose. They used

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