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Adding metallic mercury to some 50% nitric acid and not inhaling the fumes, then using this to amalgamate Al in water or alcohol. Works always, relieable and fast. If this is now the (I) or (II) nitrate I confess I never spent a thought on. But all mercury salts work, solubility is secondary...

Some of that is misleading. Among other places... but to the point. Hydrochloric acid does not produce hydrogen chloride when mixed with sodium chloride. Sodium chloride is a neutral salt and not react with hydrochloric acid. Sodium chloride does react with sulphuric acid to produce...