CHY 123 Chapter Notes - Chapter 15: Acid Strength, Conjugate Acid, Weak Base

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According to the arrhenius theory, acids (ha) are substances that dissociate in water to produce h+ and bases are substances that dissociate to yield oh-. The more general bronsted-l theory defines an acid as a proton donor and a base as a proton acceptor. An acid-base reaction is defined as a proton- transfer reaction. A strong acid is nearly 100% dissociated whereas a weak acid(ha) is only partially dissociated, existing as an equilibrium mix of ha, h30 and a- The strength of an acid (ha) and the strength of its conj base are inversely related. The h30 ion, a hydrated proton is called a hydronium ion. The acid strength of a binary acid (ha) increases down a group on the periodic table with decreasing strength of a h a bond and increases from left to right across a row with increasing polarity of the h a bond.

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