Hach Hardness (Calcium) Reagent Set

Hach Hardness (Calcium) Reagent Set


Hardness (calcium), EDTA method, 10 - 160 mg/L, 100 tests


  • EDTA method
  • 10 - 160 mg/L as CaCO3
  • Powder pillows, standard solution, and titration cartridge
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The sample is made alkaline (pH 12-13) with potassium hydroxide to precipitate magnesium as magnesium hydroxide. CalVer 2 Indicator is added and combines with any calcium to form a pink-red color. As EDTA is added, it reacts with the free calcium ions present. When no free calcium ions remain, the EDTA then removes the calcium complexed with the indicator, causing a color change to blue.
Notable Specifications:
  • Range: 10-160 mg/L as CaCO3
What's Included:
  • (100) CalVer 2 indicator powder pillows
  • (1) 100 mL potassium hydroxide standard solution, 8.00 N
  • (1) EDTA titration cartridge, 0.0800 M
Image Part # Product Description Price Stock Order
Hach Hardness (Calcium) Reagent Set 2447200 Hardness (calcium), EDTA method, 10 - 160 mg/L, 100 tests
Drop ships from manufacturer
Hach Hardness (Calcium) Reagent Set 2447500 Hardness (calcium), EDTA method, 100 - 4,000 mg/L, 100 tests
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Image Part # Product Description Price Stock Order
Hach Digital Titrator 1690001 Digital titrator
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