Armstrongs Acid

Name:
Armstrongs Acid
Detailed information:

Chemistry name:	naphthalene-1,5-disulfonic acid
M Formula:	C10H6(SO3H)2
Properties:
White, crystalline solid. Soluble in water.
Derivation:
Sulfonation of naphthalene with fuming sulfuric acid at low temperature followed by separation from the 1,6-isomer.
Use:
Dye intermediate.