Economical Hardness °f Kit

1 french degree

Titration of alkaline earth metals (especially calcium and magnesium) with EDTA.
Hardness is the measurement of the amount of calcium and magnesium in water. It is measured by complexometric titration against a specific indicator.
It is customary to express the values found in °f (French degrees) or in ppm CaCO3, where 1°f corresponds to 10 ppm CaCO3. In Germany, this is referred to as 'total hardness' to distinguish it from 'carbonate hardness' (corresponding to alkalinity M) and is expressed in °dH (Grad deutsche Härte, or degrees of German hardness), corresponding to 10 ppm CaO. Since the ratio of CaCO3 to CaO is 100 to 56, it follows that 1°f corresponds to 0.56°dH, while 1°dH corresponds to 1.786°f. There are also English degrees of hardness, but these are not used in our country. The French call hardness TH (Titre Hydrotimetrique) and speak of total TH to indicate the sum of calcium and magnesium.

• 2/1 bottles 15ml titrant/indicator hardness
• 1 test tube 10ml
• Instructions

- The kits are also available with German Grade 1 sensitivity (1°d)
5004: each containing 2 vials 15 ml titrant-indicator 1°d;
5007: each containing 1 bottle 15 ml titrant-indicator 1°d.
- For higher accuracy we recommend IPT Hardness 1015, in which the titrant is separated from the indicator, for better colour change

Interferences:
Copper > 2 ppm.
Aluminum, Lead, Strontium and Zinc > 5 ppm.
Manganese > 10 ppm.
Iron > 20 ppm.
Water colors such as to prevent the appreciation of the color changes of the indicator.
Low water temperatures slow down the color change of the indicator.
The recommended temperature for the analysis is between 20 and 30 ° C.