quick answer required please
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Acids and Alkalis neutralise each other out because they are opposite pH, when you add them together you produce a salt... hope it helps!
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pH stands for the "power of hydrogen". It is the hydrogen ions in water that give acids their properties.
The greater the concentration of H+ ions in the water the more powerful the acid or the lower the pH is.
When you add an acid to an alkali, the H+ ions react with the OH- ions in the alkali to form pure water.
As the H+ ions get used up, the pH goes up towards the pH 7 mark. pH 7 is considered neutral. That is the point where there are equal concetnrations of H+ ions and OH- ions, in such small quantities that they are hardly detectible.
The greater the concentration of H+ ions in the water the more powerful the acid or the lower the pH is.
When you add an acid to an alkali, the H+ ions react with the OH- ions in the alkali to form pure water.
As the H+ ions get used up, the pH goes up towards the pH 7 mark. pH 7 is considered neutral. That is the point where there are equal concetnrations of H+ ions and OH- ions, in such small quantities that they are hardly detectible.
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neutralisation reaction
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pH = - log[H+]
But
H+ + OH- ---> H2O so there are less H+
But
H+ + OH- ---> H2O so there are less H+