Question

A 36.6 mL sample of 0.2868 M hydrotelluric acid, H2Te, is titrated with 0.2868 M sodium...


A 36.6 mL sample of 0.2868 M hydrotelluric acid, H2Te, is titrated with 0.2868 M sodium hydroxide.

What is the pH after 18.3 mL, 36.6 mL, 54.9 mL and 73.2 mL of NaOH have been added?

step mL NaOH added

pH
1

18.3
2

36.6
3

54.9
4

73.2


The first and second ionization constants for H2Te are 2.3×10-3 and 1.6×10-11

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Question: A 36.6 mL sample of 0.2868 M hydrotelluric acid, H2Te, is titrated with 0.2868 M sodium hydroxide.

What is the pH after 18.3 mL, 36.6 mL, 54.9 mL and 73.2 mL of NaOH have been added?

Ans: (i) When 18.3ml of NaOH added to 36.6ml hydrotelluric acid pH is 2.63

        (ii) When 36.6ml of NaOH added to 36.6ml hydrotelluric acid pH is 7.897

        (iii) When 54.9ml of NaOH added to 36.6ml hydrotelluric acid pH is 12.76

        (iv) When 73.2ml of NaOH added to 36.6ml hydrotelluric acid pH is 12.98

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