Precision mixology challenge

Analytical and Bioanalytical Chemistry, Jan 2016

Juris Meija

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Precision mixology challenge

2016. Make sure you enter “Precision mixology challenge” in the subject line of your e-mail. The winner will be notified by e-mail and his/her name will be published on the “Analyt- ical and Bioanalytical Chemistry” homepage at http://www. springer.com/abc and in the journal (volume 408/issue 12) where readers will find the solution and a short explanation. The next Analytical Challenge will be published in 408/7 Precision mixology challenge Juris Meija 0 0 Measurement Science and Standards, National Research Council Canada , 1200 Montreal Road, Ottawa, ON K1A 0R6 , Canada - We would like to invite you to participate in the Analytical Challenge, a series of puzzles to entertain and challenge our readers. This special feature of “Analytical and Bioanalytical Chemistry” has established itself as a truly unique quiz series, with a new scientific puzzle published every other month. Readers can access the complete collection of published problems with their solutions on the ABC homepage at http://www. springer.com/abc. Test your knowledge and tease your wits in diverse areas of analytical and bioanalytical chemistry by viewing this collection. In the present challenge dilution is the topic. And please note that there is a prize to be won (a Springer book of your choice up to a value of €100). Please read on… Meet the challenge To perform a 100-fold dilution of a stock solution, for example, one can take 1 g of that solution and dilute it to 100 g in a separate container. Alternatively, one can perform a two-step serial dilution: first by taking 10 g of the stock and diluting it to 100 g, then followed by another dilution of the diluted stock (10 g to 100 g). Why would we do that? Because digital balances provide mass estimates with an uncertainty that barely varies with mass of the object. For example, a threedecimal-digit balance which is designed to weigh objects from 1 to 100 g will give results with a precision of ±0.002 g for objects weighing from 1 to 100 g. The same could be said The challenge


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Juris Meija. Precision mixology challenge, Analytical and Bioanalytical Chemistry, 2016, 7, DOI: 10.1007/s00216-015-9122-3