100 ml of a solution of mixture of NaOH and Na 2 CO 3 was first titrated with 0.1 M HCl using phenolphthalein as indicator. 17.5 ml of HCl was required for the end point. After this, methyl orange

Question

100 ml of a solution of mixture of NaOH and Na 2 ​ CO 3 ​ was first titrated with 0.1 M HCl using phenolphthalein as indicator. 17.5 ml of HCl was required for the end point. After this, methyl orange was added and 2.5 ml of same HCl was again required for next end point. Which of the following statement(s) is/are correct regarding the original 100 ml solution?

TestHub · Accepted Answer

NaOH + Na 2 ​ CO 3 ​ x mg ymg 40 x ​ + 106 y ​ = 0.1 × 17.5 106 y ​ = 2.5 × 0.1 = 0.25 y = 26.5 mg 40 X ​ = 1.75 − 0.25 = 1.50 x = 60 mg [ NaOH ] = 40 × 100 60 ​ = 0.015 M [ Na 2 ​ CO 3 ​ ] = 106 × 100 26.5 ​ = 100 0.25 ​ = 0.0025 M

Chemistry - Ionic Equilibrium Question with Solution | TestHub

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