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What are the properties of acid?
A) That is capable of donating \[{H^ + }\]
B) That has lower pH
C) \[HCl\] is an acid
D) All of the above

Last updated date: 22nd Feb 2024
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IVSAT 2024
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Hint: We must have to remember that it is easy to identify a base and an acid. As we know, a base usually contains a hydroxide ion and an acid contains \[{H^ + }\] ion. Acid can turn blue litmus red and it is sour in taste.

Complete answer:
Option A) this option can be correct as acid is an ion or molecule which is capable of donating a proton. These proton donors form Hydronium ions and are known as Arrhenius acid.
We need to remember that according to Arrhenius concept, an acid when dissolved in water releases \[{H^ + }\] since when an Arrhenius acid releases \[{H^ + }\], \[{H_2}O\] molecule accept it forming Hydronium ion(\[{H_3}{O^ + }\])
\[{H_2}O + {H^ + } \to {H_3}{O^ + }\]
Option B) This option can be correct as acid has lower \[pH\]. The value of \[pH\] in acid is below $7$, as \[pH\] =7 is neutral and \[pH\] above 7 is a base.
Option C) this option can be correct as \[HCl\] is an acid.
\[HCl\]is a strong acid which can also be known as Arrhenius acid.
On making an aqueous solution of\[HCl\], it dissociates itself into \[{H^ + }\] and \[C{l^ - }\] ions.
\[HCl \to {H^ + } + C{l^ - }\]
We need to know that as the concentration of \[{H^ + }\] increases in the solution, thus \[HCl\]is an Arrhenius acid.
Option D) this option is correct as all the options given above are correct.

Sometimes, when an Arrhenius base reacts with an Arrhenius acid the products so formed are water and a salt, this type of reaction may be called as Neutralization reaction. Also, Arrhenius theory is limited to acid-base chemistry only.
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