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Question: 5 5 a ca2 ionselective electrode was immersed in a...

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5. (5) A Ca2* ion-selective electrode was immersed in a series of standard solutions (concentration in M) whose ionic strength was constant. A plot of potential (V) versus log[Ca2 ] yielded a slope of 0.0281 and a y-intercept of 0.051. An unknown Ca solution yielded a potential of -22.5 mV with the same electrode. What is the concentration of Ca2 in the solution?
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