CHEM 150 Study Guide - Final Guide: Standard Hydrogen Electrode, Ethylenediaminetetraacetic Acid, Solubility Equilibrium

A 25.0-mL solution of 0.0460 M EDTA was added to a 49.0-mL sample containing an unknown concentration of V3 . All V3 present formed a complex, leaving excess EDTA in solution. This solution was back-titrated with a 0.0490 M Ga3 solution until all the EDTA reacted, requiring 10.0 mL of the Ga3 solution. What was the original concentration of the V3 solution?

A 25.0-mL solution of 0.0700 M EDTA was added to a 42.0-mL sample containing an unknown concentration of V3 . All V3 present formed a complex, leaving excess EDTA in solution. This solution was back-titrated with a 0.0490 M Ga3 solution until all the EDTA reacted, requiring 13.0 mL of the Ga3 solution. What was the original concentration of the V3 solution?