You are measuring moisture content of the same hotdog using the oven drying method. The aluminum weighing pan (empty and dry) weighed 1.7925 g. The weight of the pan plus sample weighed 3.7925 g. After drying the pan plus the dried residue weighed 2.6325. What was the percentage of moisture in the hotdog?

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Jean KeelingLv2

17 Dec 2019

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1. Define: (a) weighing by difference, and (b) absolute weight. What is the difference between these? Which is commonly used in analysis and why?

2. After having dried a solid sample in a weighing bottle, it was placed on the pan of an analytical balance while still warm (~ 40o C). The operator could not obtain a steady balance reading (i.e. the weight appeared to drift). Why? In which direction was the drift?

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The percentage of calcium in limestone was obtained by weighing out a 1.7067 g sample of limestone dissolving it in acid neutralizing and precipitating the calcium as calcium oxalate. The calcium oxalate was then ignited to convert it to calcium carbonate. The residue after ignition weighed 0.7321 grams. What is the percentage of calcium in limestone?

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