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Chemistry
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1,The concentration of a given NaOH(aq) solution is 1.4 M. 

i, Determine the pH of the solution.

ii,Determine the pOH of the solution.

The pH of a certain solution is 3.95.
Determine the concentration of H+ in the solution.

Determine the concen of OH- ion

Apr 2nd, 2015

1. Since NaOH is a strong base, it is fullly ionized and the concentration of hydroxide ion [OH-] is 1.4 mol/L.

The concentration of H+ ions is [H+] = 10^{-14} / [OH-] = 10^{-14} / 1.4 = 7.14 * 10^{-15}.

Then pH = - log([H+]) = 14.15  and pOH = - log([OH-]) = - log(1.4) = -0.15.

2. pH = 3.95, then the concentration [H+] = 10^{ - pH} = 10^{-3.95} = 1.12 * 10^{-4}  mol/L 

[OH-] = 10^{-14} / [H+] = 8.91 * 10^{-11} mol/L.  

Apr 2nd, 2015

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