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Determine the chloride concentration of an unknown solution
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Determine the chloride concentration of an unknown solution Objective: To standardize a given sample of silver nitrate and to determine the chloride concentration of an unknown solution. Apparatus: 250mL beaker(x2), 100mL beaker, 250mL conical flask(x2), burette, 25mL pipette, pipette filler, stand and clamp, white tile, safety goggles. Materials: Potassium chloride/potassium bromide mixture solution(6 g/dm3), sodium chloride solution(0.040M), silver nitrate solution(~0.05M), potassium chromate solution(5%m/V). Theory: The exact concentration of the silver nitrate solution can be determined by the titration reaction between the nitrate and the sodium chloride solution. Ag+(aq) + Cl-(aq) --> AgCl(s) From the above equations, = So the molarity of the silver nitrate = The chloride concentration of the unknown solution (KCl / KBr solution) can then be found as follow: Let the mass of: KCl = y g KBr = (6-y) g An equation can then be formed as follow: = ( + ) The mass of the KCl and KBr can be found by solving the equation. The chloride concentration = Procedures: 1. 25mL of...
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