Reaction 1
1. Obtain and wear goggles.
2. Connect the Temperature Probe to LabQuest and choose New from the File menu. If you have an older sensor that does not auto-ID, manually set up the sensor.
3. Use a utility clamp to suspend a Temperature Probe from a ring stand as shown in Figure 1.
4. Place a Styrofoam cup into a 250 mL beaker as shown in Figure 1. Measure out 100.0 mL of water into the Styrofoam cup. Lower the Temperature Probe into the solution.
5. Weigh out about 2 g of solid sodium hydroxide, NaOH, and record the mass to the nearest 0.01 g. Since sodium hydroxide readily picks up moisture from the air, it is necessary to weigh it and proceed to the next step without delay. CAUTION: Handle the NaOH and resulting solution with care.
6. Start data collection and obtain the initial temperature, t1. Monitor temperature (in °C) on the screen. It may take several seconds for the Temperature Probe to equilibrate at the temperature of the solution. After three or four readings at the same temperature have been obtained, add the solid NaOH to the Styrofoam cup. Using the stirring rod, stir continuously until the temperature has maximized and then begun to drop. Record the maximum temperature, t2.
7. Data collection will stop after 3 minutes (or stop before 3 minutes have elapsed).
8. To confirm the initial (t1) and final (t2) values you recorded earlier, examine the data points along the curve on the displayed graph. As you tap each point, the temperature and time values are displayed to the right of the graph.
9. Rinse and dry the Temperature Probe, Styrofoam cup, and stirring rod. Dispose of the solution as directed by your instructor.
Reaction 2
10. Repeat Steps 4–9, using 100.0 mL of 0.50 M hydrochloric acid, HCl, instead of water. Use the same amount of solid NaOH as before.
Reaction 11. Obtain and wear goggles.2. Connect the Temperature Probe to LabQuest and choose New from the File menu. If you have an older sensor that does not auto-ID, manually set up the sensor.3. Use a utility clamp to suspend a Temperature Probe from a ring stand as shown in Figure 1.4. Place a Styrofoam cup into a 250 mL beaker as shown in Figure 1. Measure out 100.0 mL of water into the Styrofoam cup. Lower the Temperature Probe into the solution.5. Weigh out about 2 g of solid sodium hydroxide, NaOH, and record the mass to the nearest 0.01 g. Since sodium hydroxide readily picks up moisture from the air, it is necessary to weigh it and proceed to the next step without delay. CAUTION: Handle the NaOH and resulting solution with care.6. Start data collection and obtain the initial temperature, t1. Monitor temperature (in °C) on the screen. It may take several seconds for the Temperature Probe to equilibrate at the temperature of the solution. After three or four readings at the same temperature have been obtained, add the solid NaOH to the Styrofoam cup. Using the stirring rod, stir continuously until the temperature has maximized and then begun to drop. Record the maximum temperature, t2.7. Data collection will stop after 3 minutes (or stop before 3 minutes have elapsed). 8. To confirm the initial (t1) and final (t2) values you recorded earlier, examine the data points along the curve on the displayed graph. As you tap each point, the temperature and time values are displayed to the right of the graph. 9. ล้าง และแห้งหัว วัดอุณหภูมิ ถ้วยโฟม และกวนคัน ทิ้งของโซลูชันนำ โดยอาจารย์ของคุณปฏิกิริยา 210. ทำซ้ำขั้นตอนที่ 4 – 9 การใช้กรดไฮโดรคลอริก 0.50 M, HCl, 100.0 มิลลิลิตรแทนน้ำ ใช้ NaOH ไม้กันเป็นก่อน
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