Chemistry

posted by Christine

Given the following acid dissociation constants, which acid has the strongest conjugate base?
a. HCN Ka = 6.2 x 10-10
b. HOCl Ka = 3.0 x 10-8
c. HIO3 Ka = 0.17

I believe the answer is HCN it has the lowest Ka and is the weakest acid.

  1. DrBob222

    Kb = Kw/Ka = ?
    Larger Kb means stronger base. I put in this extra step so as not to confuse Ka and Kb.
    The weakest acid should be the strongest base.

  2. Christine

    HCN Kb = 1.0 x 10^-14/6.2 x 10^-10 = 1.61 x 10^-5
    HOCl Kb = 1.0 x 10^-14/3.0 x 0^-8 = 3.3 x 10^-7
    HIO3 Kb = 1.0 x 10^-14/.17 = 5.88 x 10^-14

    The strongest Kb appears to be HCN. Is this correct?

  3. Jameson

    Are you doing AP Chem? I can help

Respond to this Question

First Name

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. chem 2

    indictae the reactant that is a bronsted lowry acid. HCN(aq) +H2O (l)---> H3O+(aq)=CN-(aq) HCN CN- H20 H30 i think it is HCN the weak acid substance which acts as a proton (H+) donor and CN the weak base?
  3. chemistry

    What is the pH of a 1.24 mol/L solution of HCN(aq) if its Ka = 6.2 x 10-10?
  4. chem

    Calculate the pH of 0.20 M NaCN solution. NaCN ---> Na+ + CN- CN- + H20+ ---> HCN+ + OH- Initial conc. of CN- = 0.20 mol/L change = -x equillibrium = 0.20-x HCN equill. = +x OH equill. = 1x10^-7+x Ka= 6.2 x 10^-10 Kb = KW/Ka …
  5. Chemistry (repost)

    Which of the following pairs of substances, when mixed in any proportion you wish, can be used to prepare a buffer solution?
  6. chemistry 12

    Identify the two conjugate acid-base pairs in each of the following. a.) H2PO4-(aq)+HSO4-(aq) <=> H2PO4(aq)+ SO4^-2(aq) b.) HI(aq)+ CN-(aq)<==>HCN-(aq)+ I-(aq)
  7. 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?
  8. chem

    Ok so i looked at it and tried to figure out the conj. base and acid. Are these right?
  9. Chemistry(Please just check, thank you)

    1) The approximate pH of a 3.0 X 10^-3 M solution of the strong acid H2SO4 is?
  10. chemisrty

    Rank following acids frommost to least acidic: hydrocyanic acid (HCN) Ka = 6.2 × 10−10 hypoiodous acid (HOI) Ka = 2 × 10−11 chlorous acid (HClO2) Ka = 1.2 × 10−2 acetic acid (CH3COOH) Ka = 1.8 × 10−5 1. …

More Similar Questions