Answer to Question #79163 in General Chemistry for abigail
2018-07-17T01:52:57-04:00
What is the pH at the equivalence point for the titration of 0.23 M solutions of the following acids and bases.
1)NaHSO3 (for H2SO3: Ka1=1.5×10−2, Ka2=6.3×10−8) and NaOH
2)Ba(OH)2 and HBr
1
2018-07-19T06:55:52-0400
1) Assume 1L of solution. Moles NaHSO3 = 0.23 Moles NaOH required = 0.23 Volume NaOH = 0.23mol/0.23M = 1L Total volume = 2 L HSO3^- + OH^- = SO3^2- + H2O [SO3^2-]=0.23mol/2L = 0.115 M SO3^2- + H2O = HSO3^- + OH^- 6.3×10^-8 = x^2/0.115-x x = [H3O^+]= 8.5×10^-5 pH = 4.07 2) strong acid + strong base = pH 7
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