A water sample was analysed using a sodium selective electrode. The

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A water sample was analysed using a sodium selective electrode. The electrode response was 75.0 mV. A 10.00 mL aliquot of standard 0.50 mmol/L NaCl solution was added to 10.00 mL of water sample. The well-mixed solution gave a response of 98.0 mV. What is the concentration of Na+ in the water sample?

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