Question
What do we call a pure sample that's run next to the tested substance to see if it's a component in the mixture?
Answer
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(154 Votes)
Bryn
Professional · Tutor for 6 years
Answer
It's called a Control Sample.
Explanation
The question is referring to the practice in analytical chemistry where a pure substance (usually a standard substance or a known compound) is used as a reference in an experiment to identify whether that particular substance is a component of the complex mixtures being tested. In fact, you are describing a Control sample. A Control Sample, also known as a Reference sample is a type of scientific control - its properties are well known and it does not change during an experiment. It's run under the same conditions as the test sample for quality control, validation or comparison purposes.