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19 Nov 2019
1. Write the equation for the decomposition of the hydrate Na sO, 10H,O. Label the anhydrous salt. 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 drop- lets 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. 3. A student heated an unknown hydrate, Na,S04 XH,0, in a crucible. The water was driven off, leaving the anhydrous salt in the crucible. After cooling, the mass of the anhydrous salt and water lost was calculated. The mass of the anhydrous salt was 0.695 g and the mass of water lost was 0.895 g. a. Calculate the moles of anhydrous salt in the sample. Show all steps. (The molar mass of this salt is 142.04 g.)
1. Write the equation for the decomposition of the hydrate Na sO, 10H,O. Label the anhydrous salt. 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 drop- lets 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. 3. A student heated an unknown hydrate, Na,S04 XH,0, in a crucible. The water was driven off, leaving the anhydrous salt in the crucible. After cooling, the mass of the anhydrous salt and water lost was calculated. The mass of the anhydrous salt was 0.695 g and the mass of water lost was 0.895 g. a. Calculate the moles of anhydrous salt in the sample. Show all steps. (The molar mass of this salt is 142.04 g.)
Bunny GreenfelderLv2
6 Jan 2019