• 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

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
  • Rinse a 50mL burette twice with approximately 10mL of the EDTA solution.
  • Clamp the burette in position and fill the burette to just above the zero mark with the EDTA solution.
  • Release any bubbles from the tip of the burette.
  • Bring the EDTA solution meniscus down to or below the zero mark, read, and record the burette reading to the nearest 0.01mL.
  • Titrate while stirring.
  • Add
    • 30mL EDTA
    • 15mL 1N Sodium hydroxide and then
    • 300mg Hydroxy naphthol blue (triturate on NaCl)
  • Stir vigorously as the endpoint approaches, adding fractions of a drop of titrant using a glass stir rod.
  • Note color changes: Reddish (during titration) to Burgundy (just before endpoint) and finally Blue (the endpoint.)
  • Read the burette at the endpoint 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 EDTA solution used
 Contact Us
Chemical Standards Laboratory, Inc.
Copyright © 2015

  • 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