When performing a REAGENT BLANK in chemistry, do you add or subtract the volume of the...

When performing a REAGENT BLANK in chemistry, do you add or subtract the volume of the blank determination from the volume of titrant to get the corrected volume of titrant used? In this particular experiment we are determining Ca2+ and Mg2+ in natural water samples. And, do you always add or subtract the blank reagent or does it change with reactions? Probably simple questions but they have me completely stumped. Thanks!

Expert Solution

A reagent blank objective is to find the volume of titrant consumed by all the components of the solution that are not the sample. This means our sample will consume certain volume of titrant, but our target analyte, in this case Ca+2 and Mg+2, are inside an aqueos solution, that sometimes depending of the characteristics of the solvent can affect the volume of titrant consumed. That is why we must do a reagent blank, it has the same compounds as the sample but without the analytes.

So, knowing this we can say that we have to subtract the volume of the blank determination from the volume of titrant. Let´s see it with an image:

The blank titration needs to be done when you don´t know if your solvent affects or not the volume consumed of titrant.

Let me know if you have any doubt!

queen_honey_blossom answered 19 hours ago

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