Easy Biology question but I need help

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This is the question

 " If a soution has a pOH = 10, then the pH= "

PH +  POh=14 is the equation 

Feb 7th, 2015

yes that is the equation dear...for more information, look the example i have given out here dear to prove that

Why pH + pOH = 14

Water ungergoes auto- or self-ionization as shown in the following equation.

2 H2O  -->   H3O+ + OH-

An equilibrium is established between the ions produced and the unionized water. An equilibrium expression can be written for this system.

Kw = [H3O+][OH-]

Kw is used to represent the equilibrium constant for the ionization of water. It is a special notation of the general representation Kc.

The value of Kw when measured at 25°C has been determined to be 1 x 10-14.

Mathematically, if one takes the log of both sides of the equation, remembering that when numbers are multiplied their logs are added, we arrive at the following equation.

log (1 x 10-14) = log [H3O+] + log [OH-]

The log (1 x 10-14) = - 14. 

Thus, - 14 = log[H3O+] + log [OH-]

Multiplying both sides of the equation by -1, we get

14 = - log [H3O+] - log [OH-]

The - log [H3O+] is defined as the pH, and the - log [OH-] is defined as the pOH. Substituting into the equation yields the relationship between pH and pOH of a solution.

14 = pH + pOH

Feb 7th, 2015

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