M-nitrobenzene sulphonic acid sodium salt for stripping nickel

A. The two differ; the salt is precipitated by adding NaCl to the acid solution in water. Also, note that sulphonic is often spelled sulfonic, and nitrobenzenesulfonic may be written as a single word.

m-nitrobenzene sulphonic acid
Formula: C6H5NO5S or C6H4(NO2)(SO3H)
CAS #98-47-5
Synonyms: m-nitrobenzenesulfonic acid, 3-nitrobenzenesulfonic acid.

m-nitrobenzene sulphonic acid sodium salt
Formula: C6H4NaNO5S or C6H4(NO2)(SO3Na)
CAS #127-68-4
Synonyms: m-nitrobenzenesulfonic acid sodium salt, 3-nitrobenzenesulphonic acid sodium salt, Meta-nitro Benzene Sulfonic Acid - Sodium Salt, m-Nitrobenzene sodium sulphonate.

Finishing.com honored Ken for his countless carefully
researched responses. He passed away May 14, 2015.
Rest in peace, Ken. Thank you for your hard work
which the finishing world continues to benefit from.

A. To strip you need to oxidise the metal to be dissolved and have a solvent or complexant to solubilise the cations. In the case of chemical dissolution of nickel the MNBS is the oxidant and either cyanide or the amine is the solvent. When an amine is the solvent or complexant you also need an activator which is usually a sulphur compound e.g., thiocyanate, dithiocarbamate etc. In the case of electrolytic stripping the oxidising is done by the DC voltage and the solvent ammonium nitrate or sulphuric acid.

A. Hi Kishore. Geoff said yes in the linked thread previously referenced (topic 11992), but Ken implied that you should double-check the actual chemical formula to avoid misunderstandings. To best attract new responses, please heed our advice, which is based on posting a quarter million questions here and monitoring their response level for 24 years :-)

Luck and Regards,