Chemistry Honors: Class 45

Dates

• Period F: Wednesday, April 20th
• Period A: Friday, April 22nd
• Period B: Friday, April 22nd

Lab – Calorimetry

• crystalline solid = sodium nitrate (+20.50 kJ/mole) [LINK]
• recommended amount of water = 100 mL (how will you measure this?)
• recommended amount of “salt” = 2 grams (use +-0.01 balance with weigh boat)
• stirring is VERY important
• use PASCO equipment for temp measurment
• Q: which temperature will you use if collecting over time?
• how many trials should you do?
• Clean up = lots of water down the sink
• Use tap water for the lab
• Why don’t we need distilled water?
• Note – we do not use units of “calories”
• CQ-approved web site source for help [LINK]

Analysis & Homework

• finish remainder of the lab in LNB