What is the pH of a solution whose hydrogen ion concentration is 1×10^-4 M?

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Multiple Choice

What is the pH of a solution whose hydrogen ion concentration is 1×10^-4 M?

Explanation:
pH is defined as the negative base-10 logarithm of the hydrogen ion concentration. So you take the exponent in the concentration: [H+] = 1×10^-4 M. The logarithm of 1×10^-4 is -4, and applying the negative sign gives pH = 4. This value is below 7, indicating an acidic solution. In other words, a hydrogen ion concentration of 1×10^-4 M corresponds to a moderately acidic pH of 4.

pH is defined as the negative base-10 logarithm of the hydrogen ion concentration. So you take the exponent in the concentration: [H+] = 1×10^-4 M. The logarithm of 1×10^-4 is -4, and applying the negative sign gives pH = 4. This value is below 7, indicating an acidic solution. In other words, a hydrogen ion concentration of 1×10^-4 M corresponds to a moderately acidic pH of 4.

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