"salt of a silicic acid," 1811, from silica + -ate (3).

1797, from Late Latin stannum "tin" (see stannic) + -ate (3).

salt of sulfuric acid, 1790 (sulphat), from French sulphate (1787), from Modern Latin sulphatum acidum, from Latin sulpur, sulphur (see sulfur) + chemical ending -ate (3). The spelling with -ph- is standard in Britain.