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Chapter: 10th Science : Chapter 10 : Types of Chemical Reactions

pH Calculation

The pH is the negative logarithm of the hydrogen ion concentration

pH CALCULATION

The pH is the negative logarithm of the hydrogen ion concentration

pH = –log10 [H+]

 

Example: Calculate the pH of 0.01 M HNO3?

Solution:

[H+] = 0.01

pH = –log10 [H+]

pH = –log10 [0.01]

pH = –log10 [1 × 102]

pH = –(log101 – 2 log1010)

pH = 0 + 2 × log1010

pH = 0 + 2 × 1 = 2

pH = 2

 

pOH: The pOH of an aqueous solution is realted to the pH.

The pOH is the negative logarithm of the hydroxyl ion concentration

pOH = –log10[OH]

 

Example:

The hydroxyl ion concentration of a solution is 1 × 109M. What is the pOH of the solution?

Solution

pOH = –log10 [OH]

pOH = –log10 [1 × 109]

pOH = –(log10 1.0 + log10 109)

pOH = –(0–9 log1010)

pOH = –(0 – 9)

pOH = 9

 

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 value can be calculated.

 

Example: A solution has a pOH of 11.76.

What is the pH of this solution?

pH = 14 – pOH

pH = 14 – 11.76 = 2.24

 

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10th Science : Chapter 10 : Types of Chemical Reactions : pH Calculation |


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