Chemistry question ?

Question

30.00 of H 2 SO 4 solution with an unknown concentration was titrated to a phenolphthalein endpoint with 45.79 of 0.1281 M NaOH solution. What is the concentration of the H 2 SO 4 solution?

Answer 1

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H2SO4 + 2 NaOH → Na2SO4 + 2 H2O

Supposing the same unnamed units were used for measuring both volumes of the reactants:

(45.79 x 0.1281 M NaOH) x (1 mol H2SO4 / 2 mol NaOH) / (30.00 H2SO4) =

0.09776 M H2SO4

Answer 2

NaOH(aq) is needed to neutralize 25.0 of HCl(aq) . Calculate the By titration, it is found that 20.1 of 0.173 M concentration of the HCl solution