Question

what is pH calculation​

Answer 1

Answer:

To calculate the pH of an aqueous solution you need to know the concentration of the hydronium ion in moles per liter (molarity). The pH is then calculated using the expression: pH = - log [H3O+]..

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Answer 2

Answer:

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Explanation:

To calculate the pH of an aqueous solution you need to know the concentration of the hydronium ion in moles per liter (molarity).  The pH is then calculated using the expression:

pH = - log [H3O+].

Example:  Find the pH of a 0.0025 M HCl solution.  The HCl is a strong acid and is 100% ionized in water.  The hydronium ion concentration is 0.0025 M.  Thus:

pH  =  - log (0.0025) = - ( - 2.60) = 2.60

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Calculating the Hydronium Ion Concentration from pH

The hydronium ion concentration can be found from the pH by the reverse of the mathematical operation employed to find the pH.

[H3O+] = 10-pH  or  [H3O+] = antilog (- pH)

Example:  What is the hydronium ion concentration in a solution that has a pH of 8.34?

8.34 = - log [H3O+]

- 8.34 = log [H3O+]

[H3O+] = 10-8.34 = 4.57 x 10-9 M

On a calculator, calculate 10-8.34, or "inverse" log ( - 8.34).

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Calculating pOH

To calculate the pOH of a solution you need to know the concentration of the hydroxide ion in moles per liter (molarity). The pOH is then calculated using the expression:

pOH =  - log [OH-]

Example:  What is the pOH of a solution that has a hydroxide ion concentration of 4.82 x 10-5 M?

pOH = - log [4.82 x 10-5] = - ( - 4.32) = 4.32

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Calculating the Hydroxide Ion Concentration from pOH

The hydroxide ion concentration can be found from the pOH by the reverse mathematical operation employed to find the pOH.

[OH-] = 10-pOH   or   [OH-] = antilog ( - pOH)

Example:  What is the hydroxide ion concentration in a solution that has a pOH of 5.70?

5.70 = - log [OH-]

-5.70 = log[OH-]

[OH-] = 10-5.70 = 2.00 x 10-6 M

On a calculator calculate 10-5.70, or "inverse" log (- 5.70).

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Relationship Between pH and pOH

The pH and pOH of a water solution at 25oC are related by the following equation.

pH + pOH = 14

If either the pH or the pOH of a solution is known, the other can be quickly calculated.

Example:  A solution has a pOH of 11.76.  What is the pH of this solution?

pH =  14  -  pOH = 14  -  11.76 =  2.24

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