HBr - hydrogen bromide (hydrobromic acid)

HCCH - acetylene (ethylene)

HCN - hydrocyanic acid (hydrogen cyanide)

HCONH2 - formamide "(ethanamide)

HCOO - formate ion

HCOOH - formic acid (methanoic acid)

HCOONH4 - ammonium formate

HCO3 - hydrogen carbonate ion

HC3H5O3 - lactic acid

HC5H5N+ - pyridinium ion

HC6H7O6 - ascorbic acid

HC9H7O4 - acetylsalicylic acid

HC12H17ON4SCl2 - thiamine hydrochloride (vitamin B1 hydrochloride)

HCl - hydrochloric acid (hydrogen chloride)

HClO - hypochlorous acid

HClO2 - chlorous acid

HClO3 - chloric acid

HClO4 - perchloric acid

HDO - semiheavy water (water-d1)

HF - hydrofluoric acid

HI - hydroiodic acid

HIO3 - iodic acid

HNO2 - nitrous acid

HNO3 - nitric acid (hydrogen nitrate)

HN3 - hydrazoic acid

HOCl - hypochlorous acid

HOF - hypofluorous acid

HOOCCOOH - oxalic acid

HPO42 - hydrogen phosphate ion

HSO3− - hydrogen sulfite ion

HSO4− - hydrogen sulfate

HTO - partially tritiated water (water-t)

H2 - hydrogen

H2C(CH)CN - acrylonitrile

H2CO - formaldehyde

H2CO3 - carbonic acid

H2CSO - sulfine

H2C2O4 - oxalic acid

H2C4H4O6 - tartaric acid

H2C8H4O4 - phthalic acid (H2Ph)

H2CrO4 - chromic acid

H2NCH2COOH - glycine

H2NNH2 - hydrazine

H2O - water

H2O2 - hydrogen peroxide

H2PO4− - dihydrogen phosphate ion

H2S - hydrogen sulfide (hydrosulfuric acid)

H2SO3 - sulfurous acid

H2SO4 - sulfuric acid (hydrogen sulfate)

H2S2O7 - disulfuric acid

H2S2O8 - peroxydisulfuric acid

H2SeO4 - selenic acid

H2SiO3 - silicic acid

H2TeO3 - tellurous acid

H2TiO3 - titanic acid

H3AsO4 - arsenic acid

H3CCH2CH3 - propane

H3N+CH2COO− - zwitterion

H3O+ - hydronium ion

H3PO4 - phosphoric acid

H4XeO6 - perxenic acid

H6TeO6 - telluric acid

HfBr4 - hafnium(IV) bromide

HfF4 - hafnium(IV) fluoride

HfOCl2 · 8H2O - hafnium(IV) oxychloride - octahydrate

HfOH(C2H3O2)3 - hafnium(IV) acetate - basic

Hf(SO4)2 - hafnium(IV) sulfate

Hg(BrO3)2 · 2H2O - mercury(II) bromate - dihydrate

HgBr2 - mercury(II) bromide

Hg(C2H3O2)2 - mercury(II) acetate

Hg(C7H5O2)2 · H2O - mercury(II) benzoate - monohydrate

HgClO4 · 4H2O - mercury(I) perchlorate - tetrahydrate

Hg(ClO4)2 · 3H2O - mercury(II) perchlorate - trihydrate

HgCl2 - mercury(II) chloride

Hg(IO3)2 - mercury(II) iodate

HgI2 - mercury(II) iodide

Hg(NO3)2 · H2O - mercury(II) nitrate - monohydrate

HgO - mercury(II) oxide

HgSmercury(II) sulfide (cinnabar)

Hg(SCN)2 - mercury(II) thiocyanate

HgSe - mercury(II) selenide

HgSeO3 - mercury(II) selenite

HgTe - mercury(II) telluride

HgTeO3 - mercury(II) tellurite

HgWO4 - mercury(II) tungstate

Hg2Br2 - mercury(I) bromide

Hg2Cl2 - mercury chloride

Hg2I2 - mercury iodide

Hg3(AsO4)2 - mercury(II) orthoarsenate

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