5. The calcium content in a 205.4 mg chunk of an antacid tablet (presumed to con

Question

5. The calcium content in a 205.4 mg chunk of an antacid tablet (presumed to contain no metals except calcium) was determined by digesting (dissolving) it in a few mL of concentrated acid, bringing the resulting mixture to 25.00 mL by addition of a pH 10 buffer, adding 3 drops of magnesium solution and a shot of calmagite indicator, and finally titrating to an endpoint with 27.25 mL of 0.00997 M EDTA solution. In a separate titration, the indicator blank correction for the magnesium was determined by titrating 25.00 mL of calcium free water (with the magnesium and calmagite added) to an endpoint with 1.17 mL of the EDTA solution. A) What is the % calcium (AW 40.078) in the antacid?

Explanation / Answer

Ans is 5.2 %

Related Questions

Navigate

• Browse (All)
• Browse 5
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.