LEO SZILARD National Physics Competition |
| FINAL 2000 Experimental Task |
You should determine the KCl concentration in a powder mixture as accurately as possible. The following materials are available for the measurements: There are powder mixtures on the trays numbered from 1 to 5. The KCl concentration in the powder mixtures and their mass are the following: pure (100 %) KCl mass 100 g 50 % mass concentration of KCl mass 100 g 25 % mass concentration of KCl mass 100 g unknown sample mass 100 g unknown sample mass 200 g (with the same concentration as the previous one) Unfortunately during the preparation the paper was lost on which it has been recorded which tray has what material. Based on the mass measurement the only thing we could determine that on the tray No. 5 we have the sample with mass of 200 g and unknown concentration. The jury expects from you not only the determination of the unknown concentration and its error, but they are interested in seeing your remarks regarding the measurement process and your conclusions (for example the correct sequence).
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