1. Carefully weigh out about 0.1 g of solid NaCl into a clean 250 mL beaker. Rec
ID: 630150 • Letter: 1
Question
1. Carefully weigh out about 0.1 g of solid NaCl into a clean 250 mL beaker. Record the exact mass you measured on your report form. 2. Add approximately 25 mL of distilled water to the NaCl in the beaker and gently swirl to completely dissolve the solid. Note: 25 mL can be estimated using the markings labeled on the beaker, it does not need to be precise. 3. Using a graduated cylinder, add 20 mL of 0.1 M AgNO3 solution to the sodium chloride solution. 4. On the Bunsen burner, heat the mixture to a rolling boil and allow it to boil for about 5 minutes until most of the cloudiness has disappeared. Note: the solution may not become totally clear but it should improve from the original milky/cloudy appearance. 5. Leave the beaker on the stand to cool for 5?10 minutes. Remember ? do not place any hot objects onto the countertop or table pads. 6. While waiting, weigh your empty evaporating dish and record the mass on your report form. Use a marker and place your initials or a similar identifying mark on the evaporating dish. 7. After the solution has cooled, carefully filter the solid precipitate using gravity filtration. Pour the liquid filtrate that you recover into the liquid waste container. 8. Using a spatula, carefully transfer and spread the precipitate out in the evaporating dish (do NOT place filter paper in the oven). Put the evaporating dish in the oven and let the precipitate dry for at least 30 minutes. 9. While the solid is drying in the oven, answer the questions on your lab report or work on other assignments. 10. After 30 minutes, remove the dish from the oven. Place the dish on your ring stand to cool for 5?10 minutes. Remember ? do not place any hot objects onto the countertop or table pads. 11. Weigh the dish and dried solid and record the mass on your report form. After weighing, place the solid in the chemical waste container. DO NOT RINSE ANY LIQUID INTO THE SOLID WASTE CONTAINER. Clean your evaporating dish with a brush, soap, and hot water.(Q) Based on This Give three possible sources of error in this experiment that would lead to a percent yield other than 100%. Clearly indicate whether each error would result in a higher or lower value and explain why that would be the result. NOTE: dont give any human errors.Explanation / Answer
Error 1 - incomplete drying of the solid precipitate - your yield will be greater since the mass has water ................ Error 2 - incomplete reaction between AgNO3 and NaCl - a good reason to justify this is that the precipitate formed might not include all the AgCl ..................... NaCl + AgNO3 ------> NaNO3 + AgCl (solid ppt) ------this will surely reduce the yield of since the solution will have some amounts of unreacted NaCl and AgNO3 Error 3 - this will be the filtration procedure........and this will reduce the yield ......... do rate ......
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