Question

Concentration of HCl is 0.09655 M. Concentration of NaOH is 0.100 M. a) What is the pH at equivalence point? b) Moles of HCl at equivalence point? c) Moles of NaOH at equivalence point? d) Volume of NaOH at equivalence point? 1.15 Volume NaOH added (mL) pH Moles of NaOH added 0.89 0.89 0.00010 0.89 0.00020 0.90 0.00030 0.91 0.00040 0.93 0.00050 0.94 0.00060 0.96 0.00070 0.98 0.00080 1.01 0.00090 1.03 0.00100 1.06 0.00110 1.08 0.00120 1.11 0.00130 0.00140 1.19 0.00150 1.24 0.00160 1.3 0.00170 0.00180 1.45 0.00190 1.55 0.00200 1.7 0.00210 1.99 0.00220 2.68 0.00230 10.86 0.00240 11.33 0.00250 11.54 0.00260 11.67 0.00270 11.73 0.00280 11.79 0.00290 11.85 0.00300 11.91 0.00310 11.95 0.00320 12.02 0.00330 12.1 0.00340 12.19 0.00350 122 0.00360 12.28 0.00370 12.34 0.00380 12.4 0.00390 0.00400 12.25

Answer 1

a) The pH at the equivalence point is equal to 7, since it is a strong acid and base titration.

b) There are 0.00235 mol of HCl at the equivalence point.

c) The moles of NaOH at the equivalence point are equal to those of HCl, 0.00235 mol.

d) The volume of NaOH at the equivalence point is 23.5 mL

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