Eli states that sodium phosphate is a mixture because it is composed of both sodium ions and phosphate ions.Which is the best analysis of Eli’s statement?

A mixture has a composition that can vary, but a compound has elements or ions combined in a fixed ratio. Sodium phosphate is an ionic compound: its sodium and phosphate ions occur in a definite proportion, so it has a single composition. Therefore, Eli is incorrect; sodium phosphate is a compound, not a mixture.

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