Question: The H + ion-selective electrode on the Phoenix Mars Lander has selectivity coefficients K pot HNA+ = 10 -8.6 and K pot H+,Ca2 + =

The H⁺ ion-selective electrode on the Phoenix Mars Lander has selectivity coefficients K^pot_HNA+ = 10^-8.6 and K^pot_H+,Ca2₊ = 10^-7.8. Let A be the primary ion sensed by the electrode and let its charge be z_A. Let X be an interfering ion with charge z_X. The relative error in primary ion activity due to an interfering ion is

This expression applies for errors less than ~10%. If the pH is 8.0 (A_H^₊ = 10^-8.0) and A_Na+ = 10^-2.0, what is the relative error in measuring ? If the pH is 8.0 and A_Ca²⁺ =10^-2.0, what is the relative error in measuring A_H+?

Error in AA (%)= AXZn 100

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