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The water activities of alcohol:water solutions were measured using a new water activity (a w) measurement method, and all data are provided in Table 1, Table 2.The water activities of ethanol:water and methanol:water solutions at varying molar ratios were compared to the reported calculated a w methanol:water solutions, and the water activity of an ideal solution. You can easily measure how much water and ethanol is present, then subtract 10 mL from that to find the percent ethanol in the water. Probably because of my sloppy mixing, our clear layer came to 17 mL, producing a reading of 7% ethanol instead of.

Product DetailsGrade LevelUpper ElementaryMiddle SchoolHigh SchoolCollegeStudents per Group2-4WarningsList Price1-Cup Set$49 (WK-01)6-Cup Set$291 (WK-06)8-Cup Set$381 (WK-08)10-Cup Set$469 (WK-10)Teacher TipKeep your magnetic water molecules from evaporating by telling your students to make the hexagonal ice structure as their last activity. Once you finish exploring the concepts related to ice, your students can place the ice model next to the water cup with the ethane, hydroxyl group, sodium and chloride pieces. Phantasmagoria 2. With a quick glance you will know all of the water molecules and other pieces are ready to go in the cup!' A wonderful teaching aid for biology or chemistry. They last for years!' To read reviews or post your own review of this product, please and scroll to the bottom of the page.