Iron and compounds Iron, ferrous oxide, ferric oxide, and iron oxide — Insoluble in hot and cold water. Ferric chloride, ferric nitrate, ferric sulfate, ferrous sulfate and ferrous chloride — Soluble in hot and cold water. Ferric chloride — Soluble in ethanol, methanol, and ether. Ferric nitrate and ferrous chloride — Soluble in ethanol and acetone. Ferric sulfate — Sparingly soluble in ethanol; insoluble in acetone. Ferrous sulfate — Insoluble in ethanol. Molybdenum and compounds Molybdenum — Insoluble in hot or cold water; soluble in nitric, sulfuric, and hydrochloric acids. Molybdic oxide — Sparingly soluble in water; soluble in acids and alkalies. Molybdenum disulfide — Insoluble in hot or cold water and dilute acids; soluble in hot sulfuric acid, aqua regia, and nitric acid. Ammonium molybdate — Soluble in hot or cold water, acids, and alkalies. Calcium molybdate — Insoluble in cold water; soluble in hot water. Lead molybdate — Insoluble in water and alcohol; soluble in acid and potassium hydroxide. Sodium molybdate — Soluble in hot and cold water. Nickel and compounds Nickel — Insoluble in hot and cold water; soluble in nitric, sulfuric, and hydrochloric acids. Nickel oxide — Insoluble in hot and cold water; soluble in ammonium hydroxide and acids. Nickel acetate — Soluble in cold water; insoluble in alcohol;[4] soluble in alcohol.[7] Nickel carbonate — Soluble in cold water; insoluble in hot water. Nickel hydrates — Some forms soluble, others insoluble (in water). Nickel sulfate — Soluble in hot and cold water. Platinum and compounds Platinum — Insoluble in hot or cold water and single mineral acids; soluble in aqua regia; attacked by halogens, alkali cyanides, and caustic alkalies. Platinum forms are series of complex chloroplatinate salts that are water soluble. Rhodium and compounds Rhodium — Insoluble in hot or cold water; soluble in hot sulfuric acid plus hydrochloric acid; slightly soluble in acids and aqua regia. Water-soluble rhodium compounds include rhodium trichloride, sodium chlororhodite, and rhodium carbonyl acetylacetonate. Silver and compounds Silver — Insoluble in water and inert to most acids; reacts readily in dilute nitric acid or hot concentrated sulfuric acid; soluble in fused alkali hydroxides in the presence of air. Silver oxide — Soluble in hot and cold water, acids, and alkalies. Silver acetate — Soluble in hot or cold water and nitric acid. Silver bromide — Insoluble in hot or cold water and nitric acid. Silver chloride — Soluble in hot water; slightly soluble in cold water and ammonium hydroxide. Silver cyanide — Soluble in cold water, nitric acid, and ammonium hydroxide.
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