ln an acid-base titration, a 20.0 mL HCI solution of unknown concentration requires 15.6 mL of a 0.250 M NaOH solution to reach the equivalence point. What is the concentration (M) of the unknown HCI solution?
HCl(aq) + NaOH(aq) → H2O(l) + NaCl(aq)
A. 12.1 M
B. 72.6 M
C. 320 M
D. 0.195 M
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