chem

posted by .

show why ka(kb)=kw for this pair of conjugate acid-base: H2C6H6O6 and HC6H66 ^-1

  • chem -

    It's too long and too confusing using long formulas. Let's cut that to ANY acid and its conjugate base, HA.
    The conjugate base is A^- so if we add that to water we have
    ..........A^- + HOH ==> HA^- + OH^-

    (HA)(OH^-)
    ----------- = Kb for the conjugate base.
    (A^-)

    Now let's multiply that by (H^+)/(H^+)
    I must use ..... for spacing and it still may not look very good.
    (HA)(OH^-)......(H^+)
    ----------- x ------ = Kb
    (A^-)............(H^)
    Now look at the equation.
    In the numerator, (H^+)(OH^-) = Kw.
    In the denominator, we have the reciprocal of Ka. Note that is (A^-)/(H^+)(A^-) which is just 1/Ka. Therefore, Kb = Kw*1/Kb or just Kw/Kb.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. chem

    For the following reactions, name the Bronsted-Lowry acids and bases. Then name the conjugate acid and bases. H3O+(aq) + CN-(aq) <==> HCN(aq) + H2O I'm really confused on this whole concept even thought it's not really difficult. …
  2. Chemistry

    Use the Bronsted-Lowry definitions to identify the two conjugate acid-base pairs in the following acid-base reaction: HCO3^- + S^2- <-> HS^- + CO3^2- I got it. HCO3^- is the base in the pair with CO3^2-. S^2- is the acid in the …
  3. Chemistry Logic

    How can I tell a conjugate base from a regular base and a conjugate acid from a regular acid?
  4. chemistry

    If the acid base reaction HA(aq)+B^-(aq)---> HB(aq)+A^-(aq) <--- has a k = 10^-4,which of the following statements are true & why?
  5. chem

    Ok so for question I have to state whether the element/compound is an acid, base, conjugate acid or conjugate base. Can u please tell me if i am correct and help me out with the ones i am unsure what the answer is?
  6. chem

    Ok so i looked at it and tried to figure out the conj. base and acid. Are these right?
  7. chem

    In the Bronsted-Lowry theory of acids, an acid will lose a proton (H+) and leave behind the conjugate base of the acid. The conjugate base of a strong acid is?
  8. Chemistry

    Which of the following represent conjugate acid-base pairs?
  9. Bio Chem

    The pKa of propanoic acid (propionic acid), CH3CH2COOH, is 4.87. Consider an equilibrium mixture of propanoic acid and its conjugate base with a pH of 4.87. Draw the structure of the form (acid or conjugate base) that predominates …
  10. chemistry

    Write the balanced net ionic equation for the following reaction and determine the conjugate acid-base pairs. HNO3(aq)+Li2CO3(aq)<--->LiNo3(aq)+LiHCO3(aq) Which component in the net ionic equation is the acid, the base, the conjugate …

More Similar Questions