Question

&Ammonium thiocyanate (NH&SCN) as titrant FAS as indicator SAMPLE PROBLEM 1 Volhard Method A 0.2182 g sample of Naci was assayed using 50 mL of 0.0985 N AgNO3 and 11.75 mL of 0.1340 N NH,SCN? Calculate the % NaCl in the sample. (MW of NaCl = 58.459/mol) SAMPLE PROBLEM 2 Volhard Method Trial 1 0.1250 g 46.80 ml 0.00 ml Trial 2 0.1250 g 46.55 ml 0.00 ml Weight of NaCI, g Final reading-NH,SCN, mL Initial reading-NHSCN Volume of NH,SCN used Volume of AgNO3 %NaCl Average % NaCl 25.00 mL 25.00 mL

Answer 1

In this method excess AgNO₃ is added than NaCl and then back titrated excess silver ions with thiocyanate using ferric ion as indicator

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