Hydroxy naphthol blue disodium - CAS 165660-27-5

Hydroxy naphthol blue disodium, an azo dye and metal indicator for calcium as well as a colorimetric reagent for alkaline earth metal ions (λmax = 650 nm), exhibits a reddish-pink color in calcium ion solutions at pH 12 to 13 and transitions to deep blue when disodium EDTA is introduced [1].

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165660-27-5

C20H12N2Na2O11S3

598.49

O=S(O)(C(C=CC1=C2N=NC3=C(C=C(S(=O)([O-])=O)C4=C3C=CC=C4)O)=CC1=CC(S(=O)([O-])=O)=C2O)=O.[Na+].[Na+]

-20°C

Ice Packs

Dye-Reagents