Find the concentration of H3O if the pOH of a solution is 11.700:
So far I have: pH= 14.000- pOH which is 14.000-11.700=2.300
pH = -log[H3)]
-2.300 = log[H3O]
Lost after that!!!
Help please.
You're almost there.
log(H3O^+) = -2.3
Set -2.3 up on your calculator. Press the 10x key. And the answer comes out. You should get 0.00501 or 5 x 10-3 depending upon how you have your calculator set up to display the answer.
Thanks a lot. I just couldn't get there.
To solve for the concentration of H3O+, you can use the formula for the ion product of water (Kw):
Kw = [H3O+][OH-]
At 25 degrees Celsius, the value of Kw is 1.0 x 10^-14.
Since pOH is given, you can use the relation pOH = -log[OH-] to find the concentration of OH-.
pOH = 11.700
[OH-] = 10^(-pOH)
[OH-] = 10^(-11.700)
Now, use the equation Kw = [H3O+][OH-] and the known value of Kw to find the concentration of H3O+.
1.0 x 10^-14 = [H3O+](10^(-11.700))
[H3O+] = (1.0 x 10^-14) / (10^(-11.700))
Simplify the expression by dividing the numbers and subtracting the exponents:
[H3O+] = 10^(-14 + 11.700)
[H3O+] = 10^(-2.300)
Finally, take the inverse log of -2.300 to find the concentration of H3O+.
[H3O+] = 10^(-2.300)
[H3O+] ≈ 0.00501
Therefore, the concentration of H3O+ in the solution is approximately 0.00501 M.
To find the concentration of H3O+ in a solution if you are given the pOH, you can follow these steps:
1. Start by using the equation pH + pOH = 14. Since you are given the pOH as 11.700, you can substitute it into the equation: pH + 11.700 = 14.
2. Rearrange the equation to solve for pH: pH = 14 - 11.700.
3. Subtract 11.700 from 14 to get the pH value: pH = 2.300.
4. Now, using the pH value of 2.300, you can find the concentration of H3O+ (also known as [H3O+]).
5. Use the equation pH = -log[H3O+]. Rewrite the equation as 10^(-pH) = [H3O+].
6. Substitute the value of pH, which is 2.300, into the equation: 10^(-2.300) = [H3O+].
7. Use a calculator to evaluate 10^(-2.300). The result is approximately 0.00501.
8. The concentration of H3O+ ([H3O+]) is 0.00501 mol/L (or M).
Therefore, the concentration of H3O+ in the solution is 0.00501 mol/L.