Calmagite
Chemical Name: 1-(1-Hydroxy-4-methyl-2-phenylazo)-2-naphthol-4-sulfonic acid
English Name: 1-(1-Hydroxy-4-methyl-2-phenylazo)-2-naphthol-4-sulfonic acid
CAS Number: 3147-14-6
Molecular Formula: C??H??N?O?S
Molecular Weight: 358.37 g/mol
Main Applications
1. Complexometric titration indicator
- Used in EDTA titration to determine Ca2? and Mg2? content (color changes from red to blue at pH≈10).
- Commonly used in water hardness testing (e.g., determination of total Ca and Mg).
2. Spectrophotometric detection of metal ions
- Forms colored complexes with calcium and magnesium, suitable for colorimetric analysis.