2. A colorless crystalline compound when dissolved in water formed a colorless solution. This compound was heated in a clean, dry test tube. This heating produced several droplets of water on the upper region of the test tube. The residue was dissolved in water and formed a yellow-brown solution. a. Determine if this colorless crystalline compound is a true hydrate or not. b. Give reasons.
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The colorless crystalline compound is a true hydrate. Show more…
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Some pale-green crystals are strongly heated. The gases given off are passed into a container surrounded by ice and then through a solution of acidified $\mathrm{KMnO}_{4}$. The $\mathrm{KMnO}_{4}$ is decolorised, a waxy white solid is formed in the ice container; this is dissolved in water. The solution will (1) Give a precipitate with silver nitrate solution (2) Give a precipitate with barium chloride solution (3) Turn red litmus blue (4) Give blue colour with starch solution
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Some salts make hydrates when there is moisture around. Some hydrate samples can absorb light in the visible region. Therefore, they show some colors. Thus, hydrates can be used to detect the moisture in the environment. Let's say you are working in a laboratory with a group, and you are the only student who has taken chemistry courses. Your laboratory received a sample of cobalt(II) chloride, which has the formula CoCl2·xH2O. Let's say your boss asked you to find the formula of this hydrate salt sample since you are the only chemist there. From your laboratory experience, simply explain the experimental procedure you would follow to find the formula of this unknown sample. Then, use the given data for the calculation part. Mass of crucible: 32.27 g Mass of crucible + unknown hydrate: 33.92 g Color of unknown hydrate: purple Mass of crucible + anhydrous form of hydrate: 33.41 g Color of anhydrous form: sky blue
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