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What will be the chemical formula of its conjugate base?

Iodic acid, HIO3, has a pKa of 0.77. (a) What is the formula of its conjugate base? (multiple choice)?

  • Iodic acid, HIO3, has a pKa of 0.77. (a) What is the formula of its conjugate base? (multiple choice) HIO3 IO3- H2IO3+ H2IO4- OH- (b) What is the value of Kb ...show more

  • Answer:

    What s presented is stuff you should already have learned at this point. Irecommend that you review the following: http://chemwiki.ucdavis.edu/Physical_Chemistry/Acids_and_Bases/Acid/Bronsted_Concept_of_Acids_and_Bases http://chemwiki.ucdavis.edu/Physical_Chemistry/Acids_and_Bases/Acid n acid with such a pKa is classified as a strong acid, so it undergoes complete ionization in water. Additionally, without any information to the contrary, the ionization involves the removal of one H^+ from the molecule, so the anion is what is left after one H is removed: So we have HIO3 ↔ H^+ + IO3^- That means that IO3^- is the conjugate base. As a rule, the conjugate base of a strong acid is a weak base, so IO3^- is a weaker base than is acetate, CH3COO^-.

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