Synsets for "amphoteric"

Synset: amphoteric.a.01

Synonyms: amphoteric

Part of Speech: ADJECTIVE

Definition: having characteristics of both an acid and a base and capable of reacting as either


Lemmas: amphoteric amphiprotic



Antonyms: acidic


Related Wikipedia Samples:

Article Related Text
Acid dissociation constant An amphoteric substance is one that can act as an acid or as a base, depending on pH. Water (above) is amphoteric. Another example of an amphoteric molecule is the bicarbonate ion that is the conjugate base of the carbonic acid molecule HCO in the equilibrium
Cysteine Like other amino acids, cysteine has an amphoteric character.
Amphoterism In chemistry, an amphoteric compound is a molecule or ion that can react both as an acid as well as a base. Many metals (such as copper, zinc, tin, lead, aluminium, and beryllium) form amphoteric oxides or hydroxides. Amphoterism depends on the oxidation states of the oxide. Al2O3 is a amphoteric oxide
Amphoterism Metal oxides which react with both acids as well as bases to produce salts and water are known as amphoteric oxides. Amphoteric oxides include lead oxide and zinc oxide, among many others.
Scandium The oxide ScO and the hydroxide Sc(OH) are amphoteric:
Hydroxide Aluminium hydroxide Al(OH) is amphoteric and dissolves in alkaline solution.
Disodium cocoamphodiacetate Disodium cocoamphodiacetate (DSCADA) is a synthetic amphoteric surfactant routinely used in personal care products.
Uranium trioxide Uranium oxide is amphoteric and reacts as acid and as a base, depending on the conditions.
Copper(II) hydroxide Copper(II) hydroxide is mildly amphoteric. It dissolves slightly in concentrated alkali, forming [Cu(OH)].
Hydroxide The amphoteric hydroxide Al(OH) has four major crystalline forms: gibbsite (most stable), bayerite, nordstrandite and doyleite.
Compounds of zinc Zinc oxide, ZnO, is the most important manufactured compound of zinc, with a wide variety of uses. It crystallizes with the Wurtzite structure. It is amphoteric, dissolving in acids to give the aqueous Zn ion and in alkali to give the zincate (a.k.a. tetrahydroxozincate) ion, [Zn(OH)]. Zinc hydroxide, Zn(OH) is also amphoteric.
Oxide Oxides can be reacted by acids or bases. Those reacted only by acids are basic oxides; those reacted only by bases are acidic oxides. Oxides that react with both acids and bases are amphoteric. Metals tend to form basic oxides, non-metals tend to form acidic oxides, and amphoteric oxides are formed by elements near the boundary between metals and non-metals (metalloids).
Zinc oxide Zinc oxide is an amphoteric oxide. It is nearly insoluble in water, but it will dissolve in most acids, such as hydrochloric acid:
Properties of water Water is amphoteric, meaning it is both an acid and a base—it produces and ions by self ionization. This regulates the concentrations of and ions in water.
Amphoterism Some other elements which form amphoteric oxides are gallium, indium, scandium, titanium, zirconium, vanadium, chromium, iron, cobalt, copper, silver, gold, germanium, tin, antimony, bismuth, and tellurium
Lead dioxide Lead dioxide is an amphoteric compound with prevalent acidic properties. It dissolves in strong bases to form the hydroxyplumbate ion, Pb(OH):
Sodium hydroxide Other amphoteric metals are zinc and lead which dissolve in concentrated sodium hydroxide solutions to give sodium zincate and sodium plumbate respectively.
Indium Indium(III) oxide, InO, forms when indium metal is burned in air or when the hydroxide or nitrate is heated. InO adopts a structure like alumina and is amphoteric, that is able to react with both acids and bases. Indium reacts with water to reproduce soluble indium(III) hydroxide, which is also amphoteric; with alkalis to produce indates(III); and with acids to produce indium(III) salts:
Metalloid The word metalloid comes from the Latin "metallum" ("metal") and the Greek "oeides" ("resembling in form or appearance"). Several names are sometimes used synonymously although some of these have other meanings that are not necessarily interchangeable: "amphoteric element," "boundary element," "half-metal," "half-way element," "near metal," "meta-metal," "semiconductor," "semimetal" and "submetal". "Amphoteric element" is sometimes used more broadly to include transition metals capable of forming oxyanions, such as chromium and manganese. "Half-metal" is used in physics to refer to a compound (such as chromium dioxide) or alloy that can act as a conductor and an insulator. "Meta-metal" is sometimes used instead to refer to certain metals (Be, Zn, Cd, Hg, In, Tl, β-Sn, Pb) located just to the left of the metalloids on standard periodic tables. These metals are mostly diamagnetic and tend to have distorted crystalline structures, electrical conductivity values at the lower end of those of metals, and amphoteric (weakly basic) oxides. "Semimetal" sometimes refers, loosely or explicitly, to metals with incomplete metallic character in crystalline structure, electrical conductivity or electronic structure. Examples include gallium, ytterbium, bismuth and neptunium. The names "amphoteric element" and "semiconductor" are problematic as some elements referred to as metalloids do not show marked amphoteric behaviour (bismuth, for example) or semiconductivity (polonium) in their most stable forms.
Polonium dioxide In reactions, polonium dioxide behaves very much like its homologue tellurium dioxide, forming Po(IV) salts; however, the acidic character of the chalcogen oxides decreases going down the group, and polonium dioxide and polonium(IV) hydroxide are much less acidic than their lighter homologues. For example, SO, SO, SeO, SeO and TeO are acidic, but TeO is amphoteric, and PoO, while amphoteric, even shows some basic character.