How Do You Determine Concentration Of Cl In Rock Salt Solution?
Rock salt, also known as the mineral halite, is simply table salt, sodium chloride (NaCl). The classic way to determinate its chloride ion (Cl-) concentration is the Mohr method. It involves the titration of the sodium chloride solution with the solution of silver nitrate, and it follows the reaction NaCl+AgNO3=AgCl (precipitant) +NaNO3. A standard solution with the known concentration of the titrant (AgNO3) is slowly added using a burette to a flask with the sodium chloride solution of an unknown concentration. The reaction endpoint is determined with a chemical indicator. Put a 10 or 15ml aliquot of the sodium chloride solution with the unknown concentration in the flask. Add about 20ml of distilled water to the flask. Add 1ml of the potassium chromate solution. Swirl the flask for about five seconds to mix the solution. Fill out the burette with the standard solution of silver nitrate. Write down the initial volume mark. For example, the initial volume mark is 2.5ml. Add 2 to 3 drop
