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pH Calculator
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In acid base systems, the hydronium ion concentration covers more than 14 orders of magnitude. It is greater than 1M in solutions of strong acids, 10-7M in pure water and about 10-14M in solutions of strong bases. pH stands for the "hydrogen power", "power of hydrogen", or "potential of hydrogen"

The precise formula for calculating the pH and pOH is

pH = - log[H+]
pOH = - log[OH-]
[H+] = 10-pH
[OH-] = 10-pOH

By knowing the value for pH and pOH the concentration of [H+] and [OH-] ions can be calculated.
 

Steps for pH Calculator

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Step 1 :  

Read the problem and identify the values given.



Step 2 :  

Substitute the value in the corresponding formula to calculate the unknown values.


pH = -log[H3O+]


pOH = - log[OH-]


[H+] = 10-pH


[OH-] = 10-pOH





Step 3 :  

Using the value of pH identify the type of the given solution.



Problems on pH Calculator

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  1. A 0.1M solution of acetic acid has a hydrogen ion concentration of 1.3 $\times$ 10-3M. Find the pH of the solution.


    Step 1 :  

    The hydrogen ion concentration is 1.3 $\times$ 10-3M.



    Step 2 :  

    pH = -log[1.3 $\times$ 10-3]


    pH = -(2.89)


    pH = 2.89



    Step 3 :  

    The pH of 2.89 in this example is less than 7. This value indicates that the solution is definitely acidic.



    Answer  :  

    The value of pH of the given solution is 2.89



  2. Calculate the concentration of the given soultion whose pH value is given as 3.60. 


    Step 1 :  

    The pH value is given as pH = 3.60



    Step 2 :  

    Substitute the value of pH in the respective formula to find the concentration of hydrogen ions.


    [H+] = 10-pH


    [H+] = 10-3.60


    [H+] = 0.00025 = 2.5 $\times$ 10-4M



    Step 3 :  

    The concentration of [H+] ion is 2.5 $\times$ 10-4M



    Answer  :  

    The concentration value of [H+] ion 2.5 $\times$ 10-4M



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