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A student following the procedure in this lab prepared 4 solutions by adding 12.00, 23.00, 26.00,...

  1. A student following the procedure in this lab prepared 4 solutions by adding 12.00, 23.00, 26.00, and 34.00 mL of an 8.25 x 10-2 M NaOH solution to 50.00 mL of a 0.150 M solution of weak acid. The solutions were labeled 1, 2, 3, and 4 respectively. Each of the solutions was diluted to a total volume of 250 mL with DI water. The pH readings of these solutions were: (1) 6.38 (2) 6.73 (3) 6.80 (4) 6.98

PRE-LAB DATA SHEET

1

2

3

4

Initial number of moles

        HAn(aq)

        OH-(aq)

Number of moles at equilibrium

        HAn(aq)

        An-(aq)

Equilibrium concentrations, mol/L

        HAn(aq)

        An-(aq)

         H3O+(aq)

Ka

Average Ka

Which of the weak acids in Table 1 do you think your unknown acid is?

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