A calcium ion ISE gives a response of (+170 mathrm{mV}) in a (100.00 mathrm{ml}) sample solution. The

Question:

A calcium ion ISE gives a response of $+170 \mathrm{mV}$ in a $100.00 \mathrm{ml}$ sample solution. The same solution is spiked with $5.00 \mathrm{ml}$ of $0.125 \mathrm{M}$ calcium standard solution. After thorough mixing the same electrode combination gave a reading of $+193 \mathrm{mV}$. Assuming a Nernstian response and no interferences, calculate the concentration of $\mathrm{Ca}^{2+}$ in the original sample solution.

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