Experiment 1 - "A" Questions 1. Describe the...

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“A” Questions 1. Describe the general principle of operation and construction of a glass pH electrode The glass pH electrode is constructed from a variety of materials used for different parts of the electrode. It consists of an electrode membrane that reacts to the pH, solution inside the glass electrode, an internal electrode, a lead wire and a glass electrode terminal. The glass pH electrode works mostly due to the electrode membrane which responds to the pH after which the membrane must generate a potential that accurately responds to the pH of the solution. 2. Derive an expression relating the pH of a buffer solution to the pK a of the weak acid involved and the concentrations of a weak acid and it’s conjugate base. (Hint: use the definition of K a as your starting point): HA ↔ H + + A - and K a = [H + ][A - ]/[HA] Where [HA] = concentration of un-dissociated weak acid and [A - ] = concentration of conjugate base of HA 3. Define the equivalence point. At the half-way point in the titration of a weak acid with a strong base the pH was measured at 5.40. What is the acidity constant and the pK
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This note was uploaded on 06/15/2010 for the course AP 31239 taught by Professor Meher during the Spring '10 term at Acton School of Business.

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Experiment 1 - "A" Questions 1. Describe the...

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