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In chemistry, a lower case p means 'the negative log of-'. This means that pH is the negative log of the concentration of H+ in a solution. To put it in terms of math:

pH = -log[H+]

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Paul Wyman

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2y ago
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14y ago

pH = -log10[H+] (pH is the minus log of the hydrogen ion concentration) A low pH value means lots of H+ eg in sulphuric acid, pH 2 or 3. A high pH means less H+ eg if the solution is alkaline, pH 13-14. On your calculator, it's easy to get from H+ to pH. To get from pH to H+ you need to either do 10-pH or do shift log (minus number). Practice a few to make sure you can get the sequence right on your calculator : pH 7 (neutral) should come out as 1 x 10-7 hydrogen ions.

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12y ago

You can use pH, OH-, and H+ to calculate each other. If you take the -log10 of [H+], you can get the pH. If you take 10^(-pH), you can get the [H+]. You can get the OH- concentration by dividing the Kw(the self-ionization constant of H2O, 1E-14) by the H+ concentration. By taking the -log10 of [OH-], you can calculate the pOH and to get the pH, you subtract the pOH from 14. (You get 14 by taking the -log10 of the Kw.)

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14y ago

In chemistry, a lower case p means 'the negative log of-'. This means that pH is the negative log of the concentration of H+ in a solution. To put it in terms of math:

pH = -log[H+]

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12y ago

the more hydrated hydrogen ions, the lower the pH value of the solution.

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Q: Relation between pH value and H ions?
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The nature of the solution be it acidic or basic will determine the PH value of the given solution.


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pH is the measure of H+ ions. The more the concentration of H+ ions, the less the pH value and the more the concentration of OH- ions and lesser the concentration of H+ ions, the more is the pH value.


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