Post a New Question

chemistry

posted by .

A weak base that encompasses a concentration of 1.4 mol per litre has a percent ionization of 0.63%. Calculate the Kb of this weak base

  • chemistry -

    Let's call a weak base BOH.
    BOH ==> B^+ + OH^-

    Kb = (B^+)(OH^-)/(BOH)

    Look at the ICE chart.
    I = initial concn (before ionization):
    BOH = 1.4 mols/L.
    (B^+) = 0
    (OH^-) = 0

    C = change in concn:
    (B+) = +1.4*0.0063
    (OH^-) = +1.4*0.0063
    (BOH^-) = 1.4*0.9937 (0.9937 is the fraction from 100%-0.63% = 99.37%)

    E = equilibrium concn:
    (B^+) = 1.4*0.0063 = ??
    (OH^-) = 1.4^0.0063 = ??
    (BOH) = 1.4-(1.4*0.0063) OR (1.4*0.9937= ??)

    Substitute the equilibrium numbers into Ka expression and calculate Ka.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Chemistry

    If an equal number of moles of the weak acid HOCN and the strong base KOH are added to water, the resulting solution will be acidic, basic or neutral?
  2. Chemistry

    I have an assignment Q A 0.1 mol L-1 water solution of NH4CH3CO2 has a pH of approx 7. Explain this using two equations. I have one equation CH3COO-(aq) + H2O(l) --> CH3COOH(aq) + OH-(aq) What could the other equation be?
  3. chemistry

    A weak base with a concentration of 1.3 mol/L has a percent ionization of 0.72%. What is the Kb of this weak base?
  4. chemistry

    A weak base with a concentration of 1.3 mol/L has a percent ionization of 0.72%. What is the Kb of this weak base?
  5. Chem

    Methylaime, CH3NH2. If a 0.100 mol/L solution of methyamine has a pH of 11.80, calculate the ionization constant for the weak base. What is an ionization constant. Is it just K?
  6. biochemistry

    A weak base has pKb = 9.25.. A. Calculate the % ionization at pH = 8.25 B. Calculate the % ionization at pH = 10.25 C. What is the pH when 50% of the weak base is ionized?
  7. Chemistry 12

    name a compound that acts as a weak base?
  8. Chemistry

    Aniline, C6H5NH2, is a weak base. If the hydroxide ion concentration of a 0.223 M solution is 9.7 10-6 M, what is the ionization constant for the base?
  9. Chemistry

    Aniline, C6H5NH2, is a weak base. If the hydroxide ion concentration of a 0.201 M solution is 9.2 10-6 M, what is the ionization constant for the base?
  10. AP Chemistry

    A solution is prepared by titrating a 100.0 mL sample of 0.10 M HF (Ka = 7.2 × 10-4) with 0.10 M NaOH a. Does the solution contain a strong acid with a strong base, a strong acid with a weak base, a weak acid with a strong base, or …

More Similar Questions

Post a New Question