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If the pH of a solution is 8, What are the hydrogen ion and hydroxide ion concentrations?
If the pH of a solution is 8, What are the hydrogen ion and hydroxide ion concentrations?
I know the formula is
pH=pKa + log[OH-]/[H+]
but how i apply this to solve the problem? It's probably really easy, but I don't get it. Please help me.
5 Answers
- †ђ!ηK †αηK²Lv 61 decade agoFavorite Answer
Instead of pH=pKa + log[OH-]/[H+], it will be much easier to use pH = -log[H+], then [H+][OH-]=1.0 x 10^-14
[H+]= 1.0 x 10^-8
[OH-] = 1.0 x 10 ^ -6
- 1 decade ago
pH(acid)+ pH(alkali)=14 given formula
formula of alkali
pH=-logH plus
OHplus=10 to the power of -8
so for acid =14-8
=6
H plus=10 to the power of -6
- Wyk123Lv 41 decade ago
pH=8 means [H+]= 1*10-8M
According to the formulae,
pKa= pH+pOH
14=8+pOH
pOH=6
[OH-]=10-6M
- 1 decade ago
[H+] = 10^-pH
[H+] = 10^-8
[H+] = 1.0 x 10^-8
You need the Kw of water to find the concentration of OH-.
Kw = 1.0 x 10^-14
Kw = [H+][OH-]
[OH-] = Kw/[H+]
Plug the numbers in and you should get it. :)
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