Instructions for Use

Pour

• Unscrew Cap. 
• Extract the plug carefully. Use a firm grip to avoid dropping.
• Rinse inside and outside of the bottom part of the blind plug with 5-10mL of water while holding it over the beaker to capture the liquid.
• Pour entire contents of the Standardette® Solution into the beaker.
• Rinse the inside of the ampule 5 times with intermediate swirling into the beaker. Use 5- 10mL of water for each rinse.
• Top up volume in beaker to ~80mL with DI water.

Titrate

• Add 1mL of 5% (aq) K2CrO4 Indicator Solution.
• Rinse a 50mL burette twice with about 10mL of AgNO3 solution.
• Clamp the burette in position and fill the burette to just above the zero mark with the
• < >Release any bubbles from the tip of the burette.
• Bring the AgNO3 solution meniscus down to or below the zero mark, read, and record the burette reading to the nearest 0.01mL.
• Titrate.
• Note that although the Silver chloride that forms is a white precipitate, the Chromate indicator initially gives the cloudy solution a faint lemon-yellow color.
• Stir vigorously as the endpoint approaches, adding fractions of a drop of titrant using a glass stir rod.
• Stop at the endpoint of the titration which is the first appearance of a red-brown color of Silver chromate.
• Read the burette to the nearest 0.01mL.
• Complete the titration in exactly 3 minutes.
• Correct the volume of titrant to 20°C.

 
Calculate

• Normality = Meq on the label /mL of Silver nitrate solution used