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how does purity improve accuracy

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J.R. S. | Ph.D. in Biochemistry--University Professor--Chemistry TutorPh.D. in Biochemistry--University Profes...
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This will ultimately depend on what the measurement is.  For example, if the property being measured is an intrinsic property, then an impurity will affect the result.  Example:  density of a substance.  An impurity will add mass but not volume so the measured density will be greater than the actual density, and thus will affect accuracy.  If the property being measured is an extrinsic property, then an impurity may not have any effect on accuracy.  Example:  volume of a sample.  An impurity may not have any measurable effect on the measured volume and in this case, it would have no effect on accuracy.