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Chemical Standards Laboratory

 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 acid solution used
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  • Home
  • About Us
    • Our History
    • Contact
  • Standardette® Solutions
    • About Standardette® Solutions >
      • Arsenious Oxide
      • Calcium Salt
      • Hydrochloric Acid
      • Potassium Hydrogen Phthalate
      • Potassium Iodate
      • Sodium Chloride
      • Sodium Hydroxide
      • Sodium Oxalate
      • Sulfuric Acid
    • Products & Pricing
    • Instruction for Use
  • #TryMeFree
  • To Order