A sample of grape juice has a pH of 4.85. What is the hydroxide ion concentration of this solution?
Answer:
ok, firstly, I will use [H+] to mean concentration of hydrogen/hydronium ions and [OH-] to mean concentration of hydroxide ions
we know that the pH + pOH always = 14 because the Keq of water = 10^-14
therefore,
pOH = 14 - 4.85
pOH = 9.15
so, using the definition of pOH/pH we know that:
-log[OH-] = 9.15
then, by doing inverse fxn of log, which is exponents, we know
[OH-] =10 ^ (-9.15) M
Raise 10 to the power of 4.85, which gives you the hydrogen ion concentration and then dividie 1 E-14 (the total of both concentrations) by that answer.
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