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What are the possible sources of error when reacting sodium bicarbonate and hydrochloric acid within an evaporating dish over wire gauze over a bunsen burner? We used as much HCl until the sodium bicarbonate in the evaporating dish stopped bubbling (HCl=excess). Procedure of the lab down below.

What are the possible sources of error when reacting sodium bicarbonate and hydrochloric acid within an evaporating dish over wire gauze over a bunsen burner? We used as much HCl until the sodium bicarbonate in the evaporating dish stopped bubbling (HCl=excess). Procedure of the lab down below.

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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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What are the possible sources of error when reacting sodium bicarbonate and hydrochloric acid within an evaporating dish over wire gauze over a bunsen burner? We used as much HCl until the sodium bicarbonate in the evaporating dish stopped bubbling (HCl=excess). Procedure of the lab down below.

Procedure 1. Flame dry a clean evaporating dish by heating it in the hot part of a burner flame for about 5 minutes. Allow the dish to cool. 2. Find the combined mass of the evaporating dish plus a watch glass. Record this mass in your list of data 3. Using a microspatula, add 2.50 g sodium hydrogen carbonate (NaHCO3) to the evaporating dish. Record the total mass in your list of data. 4. Set up the ring stand, ring, and wire gauze as shown in Figure 16-1. Place the watch glass on top of the evaporating dish and place the dish on the wire gauze. 6. Holding the burner in your hand, gently heat the evaporating dish. Use a low flame and move the burner back and forth to avoid spattering. When almost all the liquid is gone, remove the burner and replace the watch glass on the evaporating dish, leaving a small opening for vapor to escape. Heat gently again until no liquid remains. Allow the dish to cool. Figure 16-1 5. Obtain about 5 mL of 6 M hydrochloric acid (HCI) in a clean, dry test tube. CAUTION: Handle this acid carefully. It can cause painful burns if it touches your skin. Using a dropper pipet, slowly add HCl to the NaHCO3 in the evaporating dish, a few drops at a time. (See Figure 16-2.) Continue adding acid until the reaction (bubbling) stops. Carefully tilt the evaporating dish back and forth a couple of times to make sure that the acid has contacted all the NaHCO3 After making sure that all bubbling has stopped, remove the watch glass and place it curved side up on the lab bench. 7. Find the combined mass of the watch glass, evaporating dish, and contents (NaCl). Record this mass in your list of data. watch glass evaporating dish dropper pipet
Transcribed Image Text:Procedure 1. Flame dry a clean evaporating dish by heating it in the hot part of a burner flame for about 5 minutes. Allow the dish to cool. 2. Find the combined mass of the evaporating dish plus a watch glass. Record this mass in your list of data 3. Using a microspatula, add 2.50 g sodium hydrogen carbonate (NaHCO3) to the evaporating dish. Record the total mass in your list of data. 4. Set up the ring stand, ring, and wire gauze as shown in Figure 16-1. Place the watch glass on top of the evaporating dish and place the dish on the wire gauze. 6. Holding the burner in your hand, gently heat the evaporating dish. Use a low flame and move the burner back and forth to avoid spattering. When almost all the liquid is gone, remove the burner and replace the watch glass on the evaporating dish, leaving a small opening for vapor to escape. Heat gently again until no liquid remains. Allow the dish to cool. Figure 16-1 5. Obtain about 5 mL of 6 M hydrochloric acid (HCI) in a clean, dry test tube. CAUTION: Handle this acid carefully. It can cause painful burns if it touches your skin. Using a dropper pipet, slowly add HCl to the NaHCO3 in the evaporating dish, a few drops at a time. (See Figure 16-2.) Continue adding acid until the reaction (bubbling) stops. Carefully tilt the evaporating dish back and forth a couple of times to make sure that the acid has contacted all the NaHCO3 After making sure that all bubbling has stopped, remove the watch glass and place it curved side up on the lab bench. 7. Find the combined mass of the watch glass, evaporating dish, and contents (NaCl). Record this mass in your list of data. watch glass evaporating dish dropper pipet
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