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Hi there, thank you so much for your help. The information missing is a titration graph with the equivalence point between about 7.8 pH and 25ml of NaOH A 50.0 mL sample of a solution of a monoprotic acid is titrated with a 0.115 M NaOH solution. The titration curve above was obtained. The concentration of the monoprotic acid is about ________ mol/L. Answers: 25.0 0.100 0.120 0.0600 0.240 I did the calculations and I got 0.0611 mol/L, but I am still a little confused about it. Could you help me!!