Data: (10 points) Record your data with the correct units and proper significant
ID: 1029243 • Letter: D
Question
Data: (10 points) Record your data with the correct units and proper significant figures. Mass of the small evaporating dish and watch glass empty Mass of the small evaporating dish, watch glass and mixture Mass of the small evaporating dish, watch glass and SiO; after drying 8g Mass of large evaporating dish and watch glass empty Mass of large evaporating dish, watch glass and NaCI after drying 162.48g 95.699 51. 009 Show method of calculation. Calculations: (25 points) e Mass of original mixture 8 699-95.G9g-3.00g Mass of recovered Sio Si2 Mass of recovered NaCl 152.48g 151g Nac Mass of recovered mixture (NaCI+ Sio 1.69 g Sio, t 0.88 g NaC1-1.97g Percent SiO, in the original mixture 1.09 ÷ 3.00% 100-3633 Percent NaCl in the original mixture 0.83,06 x100 29.331. Percent of original mixture recoveredExplanation / Answer
1. The result for amount of NaCl would be lower If some of NaCl solution is spilled over.
step 8 with higher concentration of NaCl in solution would have greater impact on result than in step 6 spilling.
2. The silicon dioxide mass calculated would be higher If the sample is not dried properly. The mass thus obtained would have mass of SiO2+water.
3. The error in the result may arise from a number of factors, one is spilling of solution would lower the recovered mass for both NaCl and SiO2. Second, is the transfer of solution from one container to another or while decantation might end up loosing some material in the process which would affect the final value.
4. The physical state of components such that solid NaCl and SiO2 remained as such even after recovery. This tells us that only physical changes occured and no chemical chemical change occured to the given material.
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