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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Hach Hardness (Calcium) Reagent Set2447200 Hardness (calcium), EDTA method, 10 - 160 mg/L, 100 tests
Usually ships in 3-5 days
Hach Hardness (Calcium) Reagent Set 2447500 Hardness (calcium), EDTA method, 100 - 4,000 mg/L, 100 tests
Usually ships in 3-5 days
ImagePart#Product DescriptionPriceStockOrder
Hach Digital Titrator 1690001 Digital titrator
Usually ships in 3-5 days
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.
  • Range: 10-160 mg/L as CaCO3
  • (100) CalVer 2 indicator powder pillows
  • (1) 100 mL potassium hydroxide standard solution, 8.00 N
  • (1) EDTA titration cartridge, 0.0800 M
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