If 250 ml of H2SO4 of unknown concentration with a methyl orange indicator prese

Question

If 250 ml of H2SO4 of unknown concentration with a methyl orange indicator present is titrated with [0.345 M] NaOH, the red solution turns yellow after 20.4 ml of the NaOH is added. What is the molarity of the H2SO4 solution?

Explanation / Answer

2 NaOH + H2SO4=======> Na2SO4 + 2 H2O M1 = molarity of H2SO4 = ? : V1 = volume of H2SO4 = 250mL : n1 = co-efficient of H2SO4 in balanced reaction = 1 M2 = Molarity of NaOH = 0.345 M : V2 = volume of NaOH = 20.4 mL : n2 = co-efficient of KOH in balanced reaction =2 according to titration formula (M1V1/n1) =(M2V2/n2) M1*250 /1 = (0.345*20.4)/2=3.519 M1 = 3.519/250=0.014 M H2SO4

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