Homework 3 Solutions

note you do not need to design any actual circuits

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Unformatted text preview: . State all your assumptions. You may use the second order circuit analog to the catheter ­membrane ­strain gauge system shown in class and in the book along with its second order circuit model (and transfer function) [Figure 7.8(c) of Webster 4th Ed.]. (Note: you do not need to design any actual “circuits” to record from the strain gauge.) BENG 186B Homework 6 SOLUTIONS Problem 1: Consider an H+ ­sensitive Ag/AgCl electrode to measure pH of a variety of samples of unknown ionic solutions. The H+ ­sensitive electrode is separated from the sample by a semi ­permeable membrane in an enclosure containing a 100mmol/L solution of HCl. A second Ag/AgCl electrode is inserted in the sample solution, resulting in a voltage Vout between the H+ ­sensitive and sample electrodes as shown below. The H+ ­selective membrane has a high permeability to H+ of PH+ = 1000, and much lower permeabilities to other ions including PNa+ = 1 and PCl ­ = 0.001. You may assume that RT/F∙ln10=60 mV. a. For a sample that contains only a solution of HCl, derive...
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This document was uploaded on 02/19/2014 for the course BENG 186B at UCSD.

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