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The negative logarithm of the hydroxide ion concentration of a solution is

Question

The negative logarithm of the hydroxide ion concentration of a solution is

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Solution

The negative logarithm of the hydroxide ion concentration of a solution is known as the pOH.

Here are the steps to calculate it:

  1. Determine the concentration of hydroxide ions in the solution. This is usually given in the problem or can be calculated if you know the pH and the pKw (which is 14 at 25 degrees Celsius).

  2. Take the logarithm (base 10) of the hydroxide ion concentration. This is done because the scale of ion concentrations in solutions can vary widely, and using logarithms allows us to express these concentrations in a more manageable way.

  3. Multiply the result by -1 to get the pOH. This is done because we are interested in the negative logarithm of the hydroxide ion concentration. The 'p' in pOH stands for 'negative logarithm'.

Remember, in a neutral solution at 25 degrees Celsius, the pOH is 7. If the pOH is less than 7, the solution is basic. If the pOH is greater than 7, the solution is acidic.

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