When a pure sample is run next to a tested substance to check if it is a component in the mixture it is called a ; Reference value
A reference value in a test is the average of repeated value gotten from laboratory measurements carried out in the lab using an accurate measurement tool. It is the bench mark value for which the value of any tested substance will be compared to.
Therefore to verify if a tested substance is a component in the mixture we have to run it next to a pure sample ( reference value ).
Hence we can conclude that When a pure sample is run next to a tested substance to check if it is a component in the mixture it is called a ; Reference value
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