103. Solving a chemistry problem
The potential of the Ca-selective electrode in 20.00 ml of sample at 30°C is 20 mV. After adding 0.20 ml of 0.1000 M Ca2 solution, it became equal to 35 mV. The steepness of the electrode function is 2 mV lower than the theoretical one. How many mg of calcium is in the sample?
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