# Chapter 4 - Reactions in Aqueous Solution - Exercises: 4.48a

+6

#### Work Step by Step

Barium Sulfate, BaSO4. Barium is an alkaline earth metal so it is always +2. Oxygen is usually -2 (except in peroxide, which this is not). This means we have +2 from the barium and 4*-2 = -8 from the oxygens. Since the element is uncharged, it means that it must have a net charge of 0. This means we have 0 = 2 - 8 + oxidation number Sulfur. This means that Oxidation Number Sulfur = -2+8 = +6

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