chemistry

posted by .

how do you write the ionization reaction and the acid ionization constant expression for the third ionization of phosphoric acid in water? Can you explain the main concepts that are involved in this?

  • chemistry -

    Just do them one at a time.
    H3PO4 ==> H^+ + H2PO4^-
    H2PO4^- ==> H^+ + HPO4^2-
    HPO4^- ==> H^+ + PO4^3-

    K is ALWAYS (products)/(reactants) and ate coefficients become exponents.
    k3 = (H^+)(PO4^3-)/(HPO4^-)
    The coefficients are 1 so everything is raised to the 1st power.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Chem 2

    A 0.15 M solution of butanoic acid, C3H7COOH, has a pH of 2.8210. Find the Ka of butanoic acid. Call buanoic acid HB. Then the ionization is HB ==> H^+ + B^- To start (HB) = 0.15 (H^+) = 0 and (B^-) = 0 After ionization, (H^+) = …
  2. CHEM HELP

    Nicotinic acid (niacin) is a monoprotic acid with the formula HC6H4NO2. A solution that is 0.012M in nicotinic acid has a pH of 3.39 at 25*C. What is the acid-ionization constant, Ka and pKa for this acid at 25*C?
  3. Chemistry

    Known: Cyanaocetic acid Ka=3.55*10^-3 ionization equation: HC3H2NO2<==> H^+ + C3H2NO2^- Unknown: pH of 0.4M of Cyanaocetic acid I can't figure out how to calculate this. I only knew how to calculate the pH value of an acid with …
  4. chemistry (acid-ionization constant)

    A 0.942 M sample of carbonic acid, H2CO3, has a measured hydronium ion concentration of 6.36 ´ 10–4 M. Calculate the acid-ionization constant of carbonic acid. The equilibrium equation is: H2CO3(aq) + H2O(l) <--><--> …
  5. chemistry

    For a week acid whose ionization constant is 1.75 x 10(-5), the pH of its solution is 3.0. Determine its degree of ionization and its percent ionization.
  6. AP CHEMISTRY

    Phosphoric acid is triprotic acid (three ionizable hydrogens). The values of its stepwise ionization constants are Ka1= 7.5E-5, Ka2= 6.2E-8, and Ka3= 4.2E-13 1) Write the chemical equation for the first ionization reaction of phosphoric …
  7. chemistry

    A 0.185 M solution of a monoprotic acid has a percent ionization of 1.55%. Determine the acid ionization constant (Ka) for the acid.
  8. chemistry

    what is the ionization reaction and acid ionization constant expression for the HS- ion in water?
  9. Chem

    What simplifying assumptions do we usually make in working problems involving equilibria of salts of polyprotic acids?
  10. chemistry

    Calculate the percent ionization of a .31 molar solution of acetic acid. The ionization constant of acetic acid is 1.8 x 10^-5

More Similar Questions