Four solutions of unknown NaOH concentration are titrated with solutions of HCl. The following table lists the volume of

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Four solutions of unknown NaOH concentration are titrated with
solutions of HCl. The following table lists the volume of each
unknown NaOH solution, the volume of HCl solution required to reach
the equivalence point, and the concentration of each HCl solution.
NaOH volume (mL) HCl volume (mL) [HCl] (M) 6.00 8.37 0.1599 16.00
10.44 0.1061 15.00 10.75 0.0889 26.00 34.18 0.1221
Part A Calculate the concentration (in M) of the unknown NaOH
solution in the first case. NaOH volume (mL) HCl volume (mL) [HCl]
(M) 6.00 8.37 0.1599
Express your answer using three significant figures.