Expert: Profile Closed - 10/5/2009

Question
Recently, I had received a stock solution of 15% Glucose/1% Starch from a chemical company. The directions on the bottle instructed the user to measure out a specific small quantity, dilute with 200 ml distilled water, stir to dissolve, then QS to 250 ml. What does QS stand for?  I believe it means to dilute to a standard volume of 250 ml.  I cannot find the abbreviation anywhere.


Answer
Hi There,and thanks for your question.

You are correct in your assumption, the abbreviation QS means "Quantity Sufficient", and translates as "make up to.....ml", using as much solvent as is needed.

Not surprised it threw you, it's an obscure and frankly silly bit of redundant nomenclature, nowadays replaced with the phrase "make up to .....ml". You were unlucky that the company you're dealing with isn't up-to-date in its labelling!

Hope this helps, thank you again.