These are called amphoteric. They can react and neutralise both acids and alkalis. Such examples include aluminum oxide, zinc oxide and beryllium oxide.
base
Water is a base. But, let's say you put lemons in the water, it would now be an acid.
HSO4 can act as a base by gaining a hydrogen ion to make H2SO4. HSO4 can act as an acid by losing a hydrogen ion to make SO4.
It's an amphoteric oxid, which means it is neither acid nor base.
Water is both an acid and a base in the sense that it donates protons to a base thus becoming hydroxide and accepts protons from an acid thus making it hydronium.
it means that water can act as a base or an acid.
Am amphoteric substance can react as a base but also as an acid.
neutralisation means nullifying the effect of one substance by another like in acid base reactions acid+base-salt(neutral)
base
both
An amphoteric compound can act as an acid but also as base.
Water is a base. But, let's say you put lemons in the water, it would now be an acid.
It's an amphoteric oxid, which means it is neither acid nor base.
HSO4 can act as a base by gaining a hydrogen ion to make H2SO4. HSO4 can act as an acid by losing a hydrogen ion to make SO4.
Water is both an acid and a base in the sense that it donates protons to a base thus becoming hydroxide and accepts protons from an acid thus making it hydronium.
A substance
The simplest way to answer this is to say that water can act as an acid or a base - giving up a proton (H+) or taking one. When put with an acid, it acts as a base and therefore accepts the proton from the acid. acid + base <---> acid + base HCl + H2O <---> Cl- + H3O+