24. The potential of the F-selective electrode immersed in 25.0 ml of the sample (25°C) changed from 105 to 80 mV with the addition of 1.00 ml of 5.0 x 10-2 M NaF. How many milligrams of fluorine is in the sample if the slope of the electrode function is known to be 3 mV below the theoretical value. Mol. weight (F) 19.0.

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