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amphoteric    
a. 两性的

两性的

amphoteric
adj 1: having characteristics of both an acid and a base and
capable of reacting as either [synonym: {amphoteric},
{amphiprotic}] [ant: {acidic}, {alkalic}, {alkaline}]


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  • How do we know if a compound is amphoteric or not?
    Sorry to tell you but your teacher's opinion is not right, just because the "react" is not enough You may say that if an oxide reacts with an acid and forms a salt or if an oxide reacts with a base forms a salt then you can say that it is an amphoteric oxide Take an example of aluminum oxide, when dissolved in HCl it will form aluminium chloride, but we can also dissolve it in NaOH, where it
  • Why is Aluminium oxide amphoteric? - Chemistry Stack Exchange
    I suggest you first find out what exactly "amphoteric" means, and then look for examples Why is sodium oxide basic, why do nitrogen oxides react acidic, etc You know, start with the simpler cases Then look for reactions that show how Al oxide can do both
  • Amphoteric character of V2O5 - Chemistry Stack Exchange
    The phrase "amphoteric though mainly acidic" means the species has more of an acidic character than a basic character the rule of thumb is that with increasing metal oxidation state, the oxide basicity gets weaker and acidity stronger
  • Determining whether something is an acid, base, or amphoteric
    An amphoteric substance can act both as an acid and a base That is, an amphoteric substance can donate protons and also accept protons $\ce {CO3^ {-2}}$ does not have any protons so it cannot act as an acid It is the conjugate base of $\ce {HCO3^ {-}}$ $\ce {HPO4^- {2}}$ is the conjugate base of $\ce {H2PO4^ {-}}$ It can accept a proton to go back to $\ce {H2PO4^ {-}}$ or it can donate a
  • How do you explain the amphoteric behaviour of amino acids? - Toppr
    Amino acids have both acidic (carboxyl) group and basic (amino) group in the same molecule In the aqueous solution the carboxyl group losses proton while amino group accepts that proton This results to fomation of zwitter ion This zwitter ionic form of α amino acid shows amphoteric behaviour, i e act both as acid and base
  • inorganic chemistry - Why is beryllium hydroxide amphoteric . . .
    Don't get hung up on the distinction between "basic" and "amphoteric" metal hydroxides The difference between beryllium hydroxide and "basic" metal hydroxides like magnesium hydroxide is less than meets the eye; under the right conditions just about any metal hydroxide can act as as acid, even sodium hydroxide [1]: Sodium amide, NaNH2, has recently been shown to be a useful catalyst to
  • Why is silicon dioxide acidic in nature and not amphoteric in nature . . .
    But in general $\ce {MO2}$ oxides of most metals are not purely basic but amphoteric Titanium, for instance, is known to form titanates and its dioxide reacts with sodium hydroxide solutions even at ambient temperature [1]
  • Why does adding excess NaOH prove amphoteric nature?
    So, why is a species amphoteric if it forms a white precipitate after reacting with hydroxide ions, then dissolves after adding an excess? An example of a problem is: "how do you prove lead (II) hydroxide is amphoteric, whereas magnesium hydroxide is not?"
  • Are there any amphoteric substances other than water and ammonia?
    First, it may be worth elucidating the nomenclature a bit and distinguishing between amphiprotic and amphoteric substances The former are those that can react as either acids or bases in the Brønsted-Lowry sense, while the latter are those that react in either manner per the broader Lewis definition As you mention, water and ammonia are amphiprotic (and thus also amphoteric by definition
  • Why is Cr2O3 amphoteric but CrO not? - Chemistry Stack Exchange
    I faced a question where I had to find the amphoteric oxides among some given oxides The answer key says $\\ce{Cr2O3} $ is amphoteric but $\\ce{CrO}$ isn't But why is that?





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