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(NURS 3123) Nursing Pathophysiology Akacidbase 2

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John Marsh
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Akacidbase 2-a solution of benzoic acid (c6h5cooh) that is 0.20 m has a ph of 2.45. what is ka for benzoic acid?

  • UniversityAuburn University
  • CourseNursing Pathophysiology (NURS 3123)

In general, an acid and a base will form a salt and water. The cation of the salt always
comes from the base and the anion of the salt always comes from the acid (as a memory
aid, keep the consonants and vowels together). Not all salts are neutral. The acid or base
properties of a salt are determined by the relative strengths of the acid and base from which
the salt originated. HCl, HBr, HI, HNO3, HClO4 and the first dissociation of H2SO4 are
strong acids. All other acids are weak. Organic acids are always weak. An easy way to
recognize and organic acid is to look for carbon in the formula. For example, acetic acid,
CH3CO2H, is a weak organic acid. The acidic hydrogen is shown in bold font. This
organic acid is often referred to, in general, as a carboxylic acid. The carboxylic acid group
is often written in a formula as –CO2H or COOH. Group IA metal hydroxides, LiOH,
NaOH, KOH, RbOH, CsOH, and in Group 2A, Ca(OH)2, Sr(OH)2 and Ba(OH)2 are typical
strong bases. Ammonia, NH3, is a weak base and organic compounds called amines are
weak bases. Amines are derivatives of ammonia. One or more of the hydrogens on
ammonia have been replaced with a carbon group. For example, methyl amine is CH3NH2.
Once again, the presence of carbon in the formula is a clear indication the base is weak. A
strong acid produces a weak conjugate base; a strong base produces a weak conjugate acid.
A weak acid produces a strong conjugate base; a weak base produces a strong conjugate
acid. If a weak conjugate acid or weak conjugate base is produced, it means that that
species is too weak to behave as an acid or base, respectively. On the other hand, if a
strong conjugate acid or strong conjugate base is produced, then that species will behave as
an acid or base, respectively. This process is called hydrolysis

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 (NURS 3123) Nursing Pathophysiology Akacidbase 2

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