Post a New Question

Chemistry -- Please Help!!

posted by .

Find the pH of a mixture of .150 M HF(aq) solution and 0.100 M HClO2(aq)

HF + H2O <--> F- + H3O+
Ka= 3.5*10^-4

So I will show my attempt below...

[HF] [F-] [H3O+]
I .150 0 0
C -x +x +x
E .15-x x x

Ka= [F-][H3O+]/[HF]
3.5*10^-4= x^2/(.150-x)
assume x is small so (.150-x) = .150
7.25*10^-3 = x^2 Take square root of both sides
x= 7.25*10^-3

[H3O+] = 7.25*10^-3

Is this right?? If it is, why don't we do any work with the .100M HClO2 soution?


  • Chemistry -- Please Help!! -

    Technically, there is no way to get a firm solution to the problem because the problem doesn't specify the mixture's composition. Your calculation is correct, as far as it goes, and your observation is correct also. According to my tables, HClO2 is a stronger acid than HF and the H^+ content will be dictated more by the HClO2 than by the HF.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Chemistry

    Calculate the end point pH, when 25 mL of 0.01 mol/L HCl solution reacts exactly with 25 mL of 0.1 mol/L NH4OH solution. NH3 Kb = 1.8 x 10^-5 This will be the pH of NH4Cl solution. NH4+ + HOH ==> NH3 + H3O^+ Ka = Kw/Kb = (NH3)(H3O^+)/(NH4^+). …
  2. chemistry

    Which reactants in the reactions below are acting as Br©ªnsted-Lowry bases?
  3. chemistry

    Calculate the value of [H3O+] in a 0.01 M HOBr solution. Ka = 2.5E-9 I'm having a problem with just writing the equilibrium expression. do you add H2O to the HOBr?
  4. chemistry

    what is the pH of a solution that is .15 M in HOCl and .25 M NaOCl after .05 mol HCl/L has been bubbled into the solution?
  5. Chemistry

    What is the percent ionization for each of the following acids?
  6. chemistry

    What is the percent ionization of 0.025 M chlorous acid, HClO2 solution?
  7. Chemistry(Please respond, thank you)

    What is the [H3O+] for a neutral solution at 50 degrees celsius?
  8. Chemistry(Please check)

    Which of the following equations correspond to the Ka2 for phosphoric acid?
  9. chemistry

    1)A solution has a [OH-] of 5.2 x 10-4. What is the [H3O+] in the solution?
  10. chemistry 121

    If a solution of 0.5 M HOAc dissociates as follows: HOAc + H2O „® H3O+ + OAc-, what is the final [H3O+] in the solution?

More Similar Questions

Post a New Question