1.
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If 25 mL of 0.20 M NaOH is added to 50 mL of 0.10 M CH3COOH (Ka = 1.8 x 10-5), what is the pH?
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2.
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A 100.0-mL solution is 0.74 M HC2H3O2 and 0.62 M NaC2H3O2. What is the pH of the solution that results from adding 1.00 g NaOH to this solution? The Ka of HC2H3O2 is 1.8 x 10-5.
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3.
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How many grams of NaC2H3O2 must be added to 250.0 mL of 0.10 M HC2H3O2 to get a pH of 4.50? Assume no volume change. The Ka of HC2H3O2 is 1.8 x 10-5.
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4.
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When making 500.0 mL of a buffer solution at pH 4.00 from 0.100 M NaCHO2 and 0.200 M HCHO2, what volume of each solution should be used to obtain a solution with the maximum buffering capacity at this pH? The Ka of HCHO2 is 1.8 x 10-4.
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5.
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Tropaeolin OOO no. 1, also known as sodium  -naphtholazobenzenesulfonate, is an acid-base indicator that is yellow at pH 7.6 and red at pH 8.9. The pH at midrange is 8.25. What is the Kin of this indicator?
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6.
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What is the pH at the point in a titration when 12.5 mL of 0.160 M NaOH has been added to 20.0 mL of 0.100 M HC2H3O2? The Ka of HC2H3O2 is 1.8 x 10-5.
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7.
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A 20.00-mL sample of a weak acid of the form HX requires 25.17 mL of 0.1161 M NaOH for titration to the equivalence point. At the equivalence point, the pH of the solution was 8.28. What was the Ka of the weak acid?
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8.
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A 20.00-mL sample of 0.1000 M HC2H3O2 was titrated with 0.1000 M NaOH. A methyl orange indicator, which has a color change range of 3.1 to 4.4, was used. If the titration was terminated as soon as the color change occurred, what would be reported as the molarity of the acetic acid? The Ka of HC2H3O2 is 1.8 x 10-5.
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9.
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In the neutralization of 50.0 mL of 0.1 M AOH (a weak base with Kb = 1.6 x 10-7) with 0.10 M H2SO4, the most correct description of the solution at the midpoint of the titration, i.e., half-neutralized, is
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10.
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A solution has [HC7H5O2] = 0.100 M and [Ca(HC7H5O2)2] = 0.200 M. Ka = 6.3 x 10-5 for HC7H5O2. If the solution volume is 5.00 L, what are the pH's of this solution (a) before and (b) after adding 5.00 mL of 10.0 M HCl and (c) after adding 10.00 mL of 5.00 M NaOH?
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