A 3.7145 g portion of disodium EDTA dihydrate (M.W. 372.24) was dissolved in enough distilled water of prepare 1.000 L of solution. A 100.0 mL water sample was adjusted to pH 10 and titrated to the Eriochrome Black T end point with 11.23 mL of the EDTA solution. When the pH of another 100.0 mL water sample was adjusted to pH 12 and titrated with EDTA, 2.11 mL of titrant was required. Calculate the concentration of Ca(II) and Mg(II) in the water. Express the answers in mg/L of CaCl2 and MgSO 4 , respectively.
A 3.7145 g portion of disodium EDTA dihydrate (M.W. 372.24) was dissolved in enough distilled water of prepare 1.000 L of solution. A 100.0 mL water sample was adjusted to pH 10 and titrated to the Eriochrome Black T end point with 11.23 mL of the EDTA solution. When the pH of another 100.0 mL water sample was adjusted to pH 12 and titrated with EDTA, 2.11 mL of titrant was required. Calculate the concentration of Ca(II) and Mg(II) in the water. Express the answers in mg/L of CaCl2 and MgSO 4 , respectively.
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter15: Acid-base Equilibria
Section: Chapter Questions
Problem 132IP: A 10.00-g sample of the ionic compound NaA, where A is the anion of a weak acid, was dissolved in...
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A 3.7145 g portion of disodium EDTA dihydrate (M.W. 372.24) was dissolved in enough
distilled water of prepare 1.000 L of solution. A 100.0 mL water sample was adjusted to
pH 10 and titrated to the Eriochrome Black T end point with 11.23 mL of the EDTA
solution. When the pH of another 100.0 mL water sample was adjusted to pH 12 and
titrated with EDTA, 2.11 mL of titrant was required. Calculate the concentration of Ca(II)
and Mg(II) in the water. Express the answers in mg/L of CaCl2 and MgSO 4 , respectively.
distilled water of prepare 1.000 L of solution. A 100.0 mL water sample was adjusted to
pH 10 and titrated to the Eriochrome Black T end point with 11.23 mL of the EDTA
solution. When the pH of another 100.0 mL water sample was adjusted to pH 12 and
titrated with EDTA, 2.11 mL of titrant was required. Calculate the concentration of Ca(II)
and Mg(II) in the water. Express the answers in mg/L of CaCl2 and MgSO 4 , respectively.
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