2-17-2011 Lecture Notes - a and K b for the amphoteric...

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Acid-base properties of salt solutions Salts that yield pH neutral solutions - a salt that consists of an anion of a strong acid and a cation of a strong base will yield a pH neutral solution - will not react with H 2 O to form H 3 O + or OH - - NaCl Na + + Cl - - Na + cation of NaOH (strong base) - Cl - anion of HCl (strong acid) - Ba(NO 3 ) 2 Ba 2+ + 2NO 3 - Salts that yield acidic solutions - NH 4 Cl ammonium chloride - NH 4 + is the cation of the weak base NH 3 (ammonia) - NH 4 Cl NH 4 + + Cl - anion of strong acid, HCl has no effect of pH - NH 4 + H 2 O = NH 3 + H 3 O + (solution will be acidic generated H 3 O + Small highly charged metal ions make up another group of cation that yield acidic solutions - CrCl 3 Cr 3+ and Cl - are pH neutral 1) Metal ion becomes hydrated Cr(H 2 O) 6 3+ 2) Then reacts with water Cr(H 2 O) 6 3+ + H 2 O = Cr(H 2 O) 5 2+ + H 3 O + (generates acidic solution) Cations of strong bases and anions of polyprotic acids that still have an ionizable proton sometimes yield acidic solutions (sometimes basic solutions, depending on the relative magnitude of K
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Unformatted text preview: a and K b for the amphoteric species-NaHSO 4-Na + cation of strong base NaOH-HSO 4-anion of diprotic acid H 2 SO 4-HSO 4-+ H 2 O = H 3 O + + HSO 4 2-(acidic because K a for HSO 4-is relatively large 1.0 x 10-2 Salts that yield basic solutions-A salt that consists of an anion of a weak acid and a cation of a strong base will yield a basic solution-NaCH 3 COO sodium acetate-CH 3 COO-(anion of acetic acid, CH 3 COOH) How does the value of K change when combining or manipulating reactions? 1) Reverse reactions-A + B C + D K-C + D A + B K = 1/K 2) Add reactions together-A + B C + D K 1-E 2F K 2-A + B + E C + D + 2F K 3 = K 1 x K 2 What happens when two different salt compounds are mixed together?-NaHCO 3 and NaHSO 3-HCO 3-and HSO 3-(both are amphoteric look at table to determine which has larger K a value)...
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2-17-2011 Lecture Notes - a and K b for the amphoteric...

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