In a Volhard titration to determine the chloride (
35.45(g)/(m)ol) concentration in a solution of a food preservative, 150.00 mL of the preservative solution is reacted with 50.0 mL of a 0.0300 M silver nitrate (
AgNO_(3);169.87(g)/(m)ol) solution. The excess silver nitrate is then back-titrated with 0.0150 M potassium thiocyanate (KSCN;
58.08(g)/(m)ol) solution. It takes 25.00 mL of the KSCN solution to reach the endpoint using Fe (III) as an indicator. (a) Write all chemical equations expressing the reactions in this determination (including the one involving the Fe (III) indicator). (b) Calculate the chloride ion concentration in the preservative solution.