Abstract
A procedure for the quantitative determination of sulfate was devised using a back-titration method. The sulfate in the sample was dissolved and precipitated as barium sulfate by the addition of a known excess of barium ions. After digestion and filtration, the filtrate and precipitate washings was titrated with a standardized EDTA solution. Results were verified with use of Thorn Smith Laboratories sulfate unknowns. Relative error for replicate determinations was less than 0.30%. This procedure can be easily adapted to any quantitative analysis course.
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