The concentration of hydroxide ions [oh–] in a solution is 8.4 × 10–5m. this solution is

basic

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration. Acids have pH ranging from 1 to 6.9, bases have pH ranging from 7.1 to 14 and neutral solutions have pH equal to 7.

Putting in the values:

Thus as pH is more than 7, the solution is basic.

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explanation:

c) should be the answer.