hydrosulfate

or hy·dro·sul·phate

[ hahy-druh-suhl-feyt ]
/ ˌhaɪ drəˈsʌl feɪt /

noun

a salt formed by the direct union of sulfuric acid with an organic base, especially an alkaloid, and usually more soluble than the base.

Origin of hydrosulfate

First recorded in 1820–30; hydro-2 + sulfate