Answer to Question #185457 in General Chemistry for samine

Question

A sample of aqueous solution containing fluoride anion with a volume of ohm / 100 was measured by potentiometric method using fluoride ion selective electrode. The potential of the electrode (relative to the reference) in this solution is 0.1v. If 10 mL of standard 100ppm fluoride solution is added to this solution, the potential changes to 0.4 v. Measures. What is the concentration of fluoride (F) in the initial solution in terms of ppm? (The slope of the trance equation is done in buffer solution with pH = 6.0.)

Answer 1

PH= 6.0

Molarity = Antilog 6.0 = 0.778M