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 6 drops of Methyl Purple Indicator Solution. (CSL recommends Methyl Purple from GFS Chemicals:  visual transition pH 4.8-5.4, purple-green.)
  
• Rinse a 50mL burette twice with about 10mL of acid solution.
• Clamp the burette in position and fill the burette to just above the zero mark with the acid solution.
• Release any bubbles from the tip of the burette.
• Bring the acid solution meniscus down to or below the zero mark, read, and record the burette reading to the nearest 0.01mL.
• Stir vigorously as the endpoint approaches, adding fractions of a drop of titrant using a glass stir rod.
• Stop at the endpoint which has steel-blue gray color. Since there are many shades of blue, take care to be consistent.
• 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 basic solution used