Water is also a pure substance. Salt easily dissolves in water, but salt water cannot be classified as a substance because its composition can vary. ... A phase is any part of a sample that has a uniform composition and properties. By definition, a pure substance or a homogeneous mixture consists of a single phase.
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Water is also a pure substance. Salt easily dissolves in water, but salt water cannot be classified as a substance because its composition can vary. ... A phase is any part of a sample that has a uniform composition and properties. By definition, a pure substance or a homogeneous mixture consists of a single phase.