Problem: You are given solutions of HCl and NaOH and must determine their concentrations. You use 67.9 mL of NaOH to titrate 100. mL of HC1 and 32.5 mL of NaOH to titrate 50.0 mL of 0.0782 M H2SO4. Find the unknown concentrations. 

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You are given solutions of HCl and NaOH and must determine their concentrations. You use 67.9 mL of NaOH to titrate 100. mL of HC1 and 32.5 mL of NaOH to titrate 50.0 mL of 0.0782 M H2SO4. Find the unknown concentrations.