Hydroxy naphthol blue disodium
Hydroxy Naphthol Blue disodium is an azo dye metal indicator used for the colorimetric detection of calcium and alkaline earth ions. At pH 12-13, it forms a reddish-pink complex with Ca2+, which turns deep blue upon EDTA chelation (λmax 650 nm) . This property makes it valuable for in vitro water hardness testing and calcium endpoint determination in complexometric titrations.
Product Specifications
CAS Number
165660-27-5
Molecular Weight
598.49
Storage Conditions
-20°C
Notes
For research use only.
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