An indirect complexation titration with EDTA can be used to determine the concentration of sulfate. A 0.2500-g sample is dissolved in water and added with Ba(NO₃)₂, this precipitated the sulfate present in the sample. The precipitate was filtered and then dissolved in 25.00 mL of 0.02000 M EDTA. The excess EDTA is then titrated against 0.01100 M Mg²⁺, which required 4.25 mL to reach the end point. A. How many mol of EDTA reacted with BaSO₄? B. How many grams of sulfate is present in the sample? C. Which of the following chemical reaction does not happen in the analysis?  a. EDTA + Mg²⁺ ⇌ Mg-EDTA b. SO₄²⁻ + Ba(NO₃)₂ ⇌ BaSO₄ + 2 NO₃⁻ c. BaSO₄ + EDTA ⇌ Ba²⁺ + SO₄-EDTA

Fundamentals Of Analytical Chemistry
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Author:Skoog
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Chapter17: Complexation And Precipitation Reactions And Titrations
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Problem 17.35QAP
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An indirect complexation titration with EDTA can be used to determine the concentration of sulfate. A 0.2500-g sample is dissolved in water and added with Ba(NO₃)₂, this precipitated the sulfate present in the sample. The precipitate was filtered and then dissolved in 25.00 mL of 0.02000 M EDTA. The excess EDTA is then titrated against 0.01100 M Mg²⁺, which required 4.25 mL to reach the end point.

A. How many mol of EDTA reacted with BaSO₄?

B. How many grams of sulfate is present in the sample?

C. Which of the following chemical reaction does not happen in the analysis? 

a. EDTA + Mg²⁺ ⇌ Mg-EDTA

b. SO₄²⁻ + Ba(NO₃)₂ ⇌ BaSO₄ + 2 NO₃⁻

c. BaSO₄ + EDTA ⇌ Ba²⁺ + SO₄-EDTA

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