The presence of H+ ions, whereas basic solutions are basic because of the presence of OH- ions.
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'Acidic' means 1: being or containing an acid; of a solution having an excess of hydrogen atoms (having a pH of less than 7); 2: being sour to the taste
acidic is has a pH value of less than 7.0
1-hexanol is an alcohol so it is a neutral compound not an acid while phenol is a strong acid.