Wednesday
April 1, 2015

Homework Help: Re: chemistry

Posted by Brunette on Saturday, December 8, 2012 at 8:10pm.

The average pH of open ocean water is 8.1. What is the maximum value of [Fe3+] in pH 8.1 seawater if the Ksp of Fe(OH)3 is 1.1*10^-36?
chemistry - DrBob222, Friday, December 7, 2012 at 10:14pm
Fe(OH)3 ==> Fe^3+ + 3OH^-
pH = 8.1
pH + pOH = pKw = 14
Therefore, pOH = 14-8.1 = ?
pOH = -log(OH^-) and
(OH^-) = ?
Ksp = (Fe^3+)(OH^-)^3
Substitute Ksp and OH^- from above into Ksp expression and solve for Fe^3+.


I cant seem to get the right answer. I have no idea if I'm doing it right. So when you subtract 8.1 from 14, you get 5.9. Is that the value for OH that you plug into the pOH equation?

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

chemistry - The average pH of open ocean water is 8.1. What is the maximum value...
Chemistry - A cublic meter of ocean water contains 6x10^-5 g of gold. If the ...
chemistry - What is the concentration of the Mg2 ion in solution when [CO3-2] = ...
Chemistry - The average concentration of chloride ions (molar mass = 34.353) in ...
Physical Chemistry - The measured osmotic pressure of seawater is 25 atm at 273K...
Chemistry(Please check) - . Ksp for Fe(IO3)3 is 10-14. Two solutions, one being ...
Chemistry - Which of the following substances has the greatest solubility in ...
Chemistry - Concentration 15.8 mg/L Final Volume 100.0 mL What is the ...
chemistry - The concentration of various cations in seawater in moles per liter ...
chemistry - For the reaction, A = B + C, the rate law is kA]. If it takes 80.0 ...

Members