Aluminum hydroxide reacts with an excess of hydroxide ions to form the complex ion Al(OH)4-
a)Write an equation for this reaction
b) Calculate K.
c) Determine the solubility of Al(OH)3 in (mol/L) at pH 12.0

My equation was
Al(OH)3 + OH- --> Al(OH)4-
but I'm wondering if I may need to balance out the OH- with H+?
Also, I'm a little confused on what K is. I know it's an equilibrium constant, but how does it differ from Ksp or Kc or Kp? Do you have to decide which constant you're looking for? And how do I find this once I determine the right constant?

Your equation is correct for the formation of Al(OH)4^-. There is nothing to balance out; i.e., atoms balance, charge balances, so nothing needs to be added.
The formation constant is just another equilibrium constant but it pertains to the formation of complex ions; therefore, they have given the name of formation constant to it just as they gave solubility constant to the solubility of ppts. The K expression is the same as all the others; that is, (products)/(reactants) with each raised to a power indicated by the coefficient.
I don't know how to calculate K with "nothing" given.
If you find K, however, then
K = [(Al(OH)4^-)/(OH^-)]
Plug in OH^- and knowing K calculate (Al(OH)4^-.

I made a typo above. it just as they gave solubility constant...... should read it just as they gave solubility PRODUCT constant.......

  1. 👍 0
  2. 👎 0
  3. 👁 265

Respond to this Question

First Name

Your Response

Similar Questions

  1. College Chemistry

    1) The concentration of the aluminum ion in a test solution is 0.10M. Using the Ksp for aluminum hydroxide (3. x 10^-34), calculate the concentration of hydroxide needed to precipitate aluminum hydroxide. From the concentration of

    asked by Zach on April 1, 2010
  2. Chemistry

    In a lab, we added NH3(aq) to CuSO4(aq), and the solution turned dark blue with a precipitate. The problem is that the products ( Cu(NH3)4 and SO4) should be soluble, no? The question is then, what is the percipitate? The ppt is

    asked by Karl on December 17, 2006
  3. Chemistry

    You are investigating the effect of strong base on the solubility of zinc hydroxide, Zn(OH)2 (s). (Ksp= 3 x 10- 15 for Zn(OH)2 (s)) You prepare 1.0 L solution of 0.10M NaOH and add excess zinc hydroxide, Zn(OH)2 (s). Instead of

    asked by Lily on April 27, 2016
  4. chemistry

    When 63.0 mL of 0.5264 M strontium hydroxide reacts with 28.4 mL of 0.2995 M cobalt(III) sulfate, two precipitates can form. Assume volumes are additive and that the reaction goes to completion. (a) Calculate the mass of each

    asked by Thomas on June 2, 2019
  5. Chemistry

    Describe the process by which adding potassium hydroxide to a saturated aluminum hydroxide solution reduces the concentration of aluminum ions. Write the solubility equilibrium equation and solubility product constant expression

    asked by Alex on May 18, 2010
  6. Chemistry

    Aluminum sulfate reacts with calcium hydroxide (from lime) to form aluminum hydroxide and calcium sulfate. Write the balanced formula unit equation for the reaction.

    asked by Ana on September 28, 2014
  7. Chemistry

    The high acid rain which falls in the Northeast frees aluminum ions from the soils. The tree absorbs the aluminium ion. The sap is basic so the aluminium ion becomes aluminum hydroxide. Aluminium hydroxide is a large bulky

    asked by I need Help on November 8, 2012
  8. Chemistry

    When HCl(aq) is exactly neutralized by NaOH(aq), the hydrogen ion concentration in the resulting mixture is a. always equal than the concentration of the hydroxide ions b.sometimes greater and sometimes less than the concentration

    asked by Julia on April 20, 2010
  9. Qualitative analysis

    Which ion reacts with aqueous sodium hydroxide to give a precipitate that dissolves in an excess of sodium hydroxide? A Ca2+ B Fe2+ C Fe3+ D Pb2+ Pls explain how to get the ans, thks!

    asked by Cheezel on November 17, 2016
  10. Chemistry-confused

    All alkalis produce hydroxide ions when dissolved in water. How do we write the chemical equation for aqueous ammonia? I see some textbooks write it as ammonia gas dissolving in water to form ammonium ions and hydroxide ions.

    asked by janice on April 10, 2009

More Similar Questions