Chapter 4.4: The Position of Equilibrium in Acid-Base Reactions
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What does a positive pKa indicate about the dissociation of the acid?
a positive value indicates that most acid molecules remain undissociated in water
What does a negative pKa indicate about the dissociation of the acid?
• A negative pKa value indicates that the majority of molecules of the acid are dissolved in water
If the majority of molecules of an acid are ubdissociated in water, is the pKa positive or negative?
positive
If the majority of molecules of an acid are dissociated in water, is the pKa positive or negative?
negative
What side of the reaction does the position of equilibrium always favor in an acid-base reaction?
• In an acid-base reaction, the position of equilibrium always favors reaction of the stronger acid and stronger base to form the weaker acid and weaker base o Thus at equilibrium the major species present are the weaker acid and weaker base