Common Reagents in Qualitative Chemical Analysis

A comprehensive vocabulary review of common chemical reagents, their formulas, and chemical names used in qualitative chemical analysis, derived from laboratory lecture notes.

Qualitative Chemical Analysis (Análisis químico cualitativo)

The branch of chemistry focused on identifying the specific chemical components, ions, or compounds present in a sample using characteristic chemical reagents.

$$CH_3COOH$$

Acetic acid (ácido acético), a common weak acid reagent used in qualitative chemical analysis.

$$HCl$$

Hydrochloric acid (ácido clorhídrico), a strong acid reagent commonly used in qualitative chemical analysis.

$$HNO_3$$

Nitric acid (ácido nítrico), a strong oxidizing acid reagent used in qualitative chemical analysis.

$$H_2SO_4$$

Sulfuric acid (ácido sulfúrico), a diprotic strong acid reagent commonly employed in qualitative chemical analysis.

$$NH_4OH$$

Ammonium hydroxide (hidróxido de amonio), a weak base reagent frequently used in precipitation tests in qualitative analysis.

$$NaOH$$

Sodium hydroxide (hidróxido de sodio), a strong base reagent used in qualitative chemical analysis.

$$(NH_4)_2CO_3$$

Ammonium carbonate (carbonato de amonio), a reagent used in qualitative analysis for the precipitation of group cations.

$$Na_2CO_3$$

Sodium carbonate (carbonato de sodio), a common alkaline reagent used in qualitative chemical analysis.

$$NaHCO_3$$

Sodium bicarbonate (bicarbonato de sodio), an amphoteric salt reagent used in qualitative chemical analysis.

$$KOH$$

Potassium hydroxide (hidróxido de potasio), a strong alkaline reagent utilized in qualitative chemical analysis.

$$(NH_4)_2C_2O_4$$

Ammonium oxalate (oxalato de amonio), an analytical reagent commonly employed for precipitating calcium and other divalent cations.

$$NaCl$$

Sodium chloride (cloruro de sodio), a standard neutral salt reagent used in qualitative chemical analysis.

$$BaCl_2$$

Barium chloride (cloruro de bario), a reagent commonly employed in qualitative analysis to test for sulfate ions ($SO_4^{2-}$).

$$CaCl_2$$

Calcium chloride (cloruro de calcio), a soluble calcium salt reagent used in qualitative chemical analysis.

$$SrCl_2$$

Strontium chloride (cloruro de estroncio), a reagent utilized in qualitative chemical testing.

$$FeCl_3$$

Iron(III) chloride (cloruro de hierro (III)), a ferric salt reagent used in qualitative chemical analysis.

$$HgCl_2$$

Mercury(II) chloride (cloruro de mercurio (II)), a mercuric reagent used in qualitative chemical analysis.

$$K_2CrO_4$$

Potassium chromate (cromato de potasio), an indicator and precipitating reagent used in qualitative chemical analysis.

$$K_2Cr_2O_7$$

Potassium dichromate (dicromato de potasio), a powerful oxidizing reagent employed in qualitative chemical analysis.

$$K_4[Fe(CN)_6]$$

Potassium ferrocyanide (ferrocianuro de potasio), a complex reagent utilized in qualitative analysis to identify ferric and other metal ions.

$$Na_3[Co(NO_2)_6]$$

Sodium cobaltinitrite (cobaltinitrito de sodio), a selective qualitative reagent primarily used to test for potassium ions ($K^+$).

$$Cu(NO_3)_2$$

Copper(II) nitrate (nitrato de cobre (II)), a cupric salt reagent used in qualitative chemical analysis.

$$AgNO_3$$

Silver nitrate (nitrato de plata), a key precipitating reagent widely used to detect halide ions in qualitative chemical analysis.

$$Fe(NO_3)_3$$

Iron(III) nitrate (nitrato de hierro (III)), a ferric reagent employed in qualitative chemical analysis.

$$Co(NO_3)_2$$

Cobalt(II) nitrate (nitrato de cobalto (II)), a cobaltous reagent used in qualitative chemical analysis.

$$Zn(NO_3)_2$$

Zinc nitrate (nitrato de zinc), a soluble zinc salt reagent used in qualitative chemical analysis.

$$SnCl_2$$

Tin(II) chloride (cloruro de estaño), a reducing agent reagent utilized in qualitative chemical analysis.

$$KCl$$

Potassium chloride (cloruro de potasio), a common potassium halide salt reagent used in qualitative chemical analysis.

$$KMnO_4$$

Potassium permanganate (permanganato de potasio), a strong oxidizing agent reagent widely used in qualitative redox testing.

$$(NH_4)_2S$$

Ammonium sulfide (sulfuro de amonio), a reagent commonly employed for precipitating group cations as insoluble sulfides in qualitative analysis.

$$(NH_4)_2SO_4$$

Ammonium sulfate (sulfato de amonio), an ammonium salt reagent used in qualitative chemical analysis.

$$MgSO_4$$

Magnesium sulfate (sulfato de magnesio), a magnesium salt reagent utilized in qualitative chemical analysis.

$$FeSO_4$$

Iron(II) sulfate (sulfato de hierro (II)), a ferrous salt reagent used as a reducing agent in qualitative chemical analysis.

$$H_2S$$

Hydrosulfuric acid or hydrogen sulfide (ácido sulfhídrico), a classic qualitative analysis reagent used to separate and precipitate metal cations as sulfides.

$$NH_4C_2H_3O_2$$

Ammonium acetate (acetato de amonio), a buffer salt reagent employed in qualitative chemical analysis.

$$KI$$

Potassium iodide (yoduro de potasio), a source of iodide ions used as a precipitating and reducing reagent in qualitative chemical analysis.

$$CCl_4$$

Carbon tetrachloride (tetracloruro de carbono), a nonpolar solvent reagent used in extraction and halide identification tests in qualitative analysis.

$$Na_2S_2O_3$$

Sodium thiosulfate (tiosulfato de sodio), a complexing and reducing agent reagent utilized in qualitative chemical analysis.

$$H_2O_2$$

Hydrogen peroxide (peróxido de hidrógeno), an oxidizing and reducing agent reagent commonly used in qualitative chemical tests.

$$Na_2SO_4$$

Sodium sulfate (sulfato de sodio), a neutral sodium salt reagent used in qualitative chemical analysis.

$$Na_2SO_3$$

Sodium sulfite (sulfito de sodio), a reducing agent reagent employed in qualitative chemical analysis.

$$NH_4SCN$$

Ammonium thiocyanate (tiocianato de amonio), an analytical reagent used particularly for the sensitive detection of ferric iron ($Fe^{3+}$).

$$KSCN$$

Potassium thiocyanate (tiocianato de potasio), a reagent that forms a deep red complex with ferric ions ($Fe^{3+}$) in qualitative analysis.

$$NaBr$$

Sodium bromide (bromuro de sodio), a source of bromide ions used in qualitative chemical analysis.

$$Bi(NO_3)_3$$

Bismuth(III) nitrate (nitrato de bismuto (III)), a bismuth salt reagent utilized in qualitative chemical analysis.

$$Pb(NO_3)_2$$

Lead(II) nitrate (nitrato de plomo (II)), a soluble lead salt reagent used in qualitative chemical precipitation tests.

$$Cd(NO_3)_2$$

Cadmium nitrate (nitrato de cadmio), a cadmium reagent employed in qualitative chemical analysis.

$$(NH_4)_2C_4H_4O_6$$

Ammonium tartrate (tartrato de amonio), an organic salt reagent utilized in qualitative chemical analysis.

$$Cr(NO_3)_3$$

Chromium(III) nitrate (nitrato de cromo (III)), a chromic salt reagent used in qualitative chemical analysis.

$$MnSO_4$$

Manganese(II) sulfate (sulfato de manganeso (II)), a manganous salt reagent utilized in qualitative chemical testing.

$$NiSO_4$$

Nickel(II) sulfate (sulfato de níquel (II)), a nickelous salt reagent employed in qualitative chemical analysis.

$$Ba(OH)_2$$

Barium hydroxide (hidróxido de bario), a strong base reagent often used in qualitative analysis to test for carbon dioxide and carbonate ions.

$$Na_2S$$

Sodium sulfide (sulfuro de sodio), a soluble sulfide source used to precipitate metal cations in qualitative chemical analysis.

$$Na_2[Fe(CN)_5NO]$$

Sodium nitroprusside (nitroprusiato de sodio), a sensitive colorimetric reagent used in qualitative analysis to detect sulfide ions ($S^{2-}$).

$$Fe_2(SO_4)_3$$

Iron(III) sulfate (sulfato de hierro (III)), a ferric sulfate reagent used in qualitative chemical analysis.

$$Al_2(SO_4)_3$$

Aluminum sulfate (sulfato de aluminio), an aluminum salt reagent utilized in qualitative chemical analysis.

$$Ni(NO_3)_2$$

Nickel nitrate (nitrato de níquel), a nickel salt reagent used in qualitative chemical analysis.