Thymol blue is used as a pH indicator. It is insoluble in water but soluble in alcohol and dilute alkali solutions. It transit from red to yellow at pH 1.2–2.8 and from yellow to blue at pH 8.0–9.6. It is usually a component of Universal indicator.
Cupric (Copper II) Sulphate Pentahydrate Extrapure AR, 99.5% , The chemical formula for Copper Sulfate Pentahydrate is CuSO4·5H2O. The highly toxic, non-combustible, odorless blue crystalline powder has a nauseating metallic taste and turns white when dehydrated.
Brand Name: SISCO
Pack Size: 500g
Cas No: 7758-98-8.
Expiry date: July 2027
Diphenylamine is used for control of superficial scald in stored apples Diphenylamine is the organic compound with the formula (C6H5)2NH.
It is a colourless solid, but samples are often yellow due to oxidized impurities. It is a weak base, with a KB of 10 14. With strong acids, it forms the water soluble salt.
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