We can find out how acidic or basic a substance is by using the pH scale. The greater the pH number is, the more basic the substance is. In order to convert from pOH to pH, we can use the equation pH = 14 - pOH. Our new pH values are then solution A = 12.5, solution B = 7.0, and solution C = 0.5. The answer is then solution A, because it has the greatest pH value.
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