In the given chemical reaction, hydrogen bromide is an acid and potassium hydroxide is a base.
According to the Arrhenius theory, acids are those substances which will gives H⁺ to the aqueous solution and base will loses hydroxide ion.
Given chemical reaction is:
HBr + KOH → KBr + H₂O
In the above reaction HBr loses H⁺ ion in the solution and combines with potassium to form KBr salt. So, in the above equation HBr is an acid and KOH is a base.
Hence HBr is an acid.
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