background [prelab assignment (10 points) due at the beginning of lab]

sketch a data table for your experimental measurements (i.e. review the purpose & content of your lab report)

msds information on NH₄NO₃

purpose

determine experimentally ΔH

• to dissolve NaOH in water [~1 g in 50 mL]
• to dissolve NH₄NO₃in water  [~3 g in 50 mL]

calculate % error for ΔH to dissolve NaOH

determine ΔH_f (NO₃^- _(aq))

materials

NaOH;  NH₄NO₃;  water

coffee cup (calorimeter); thermometer; balance

methods / analysis

student design

Content of lab report (35 points)

data analysis (20 points)

data table of your experimental data

determine ΔH_f (NO₃^- _(aq)) based on experimental data

calculate % error (of ΔH to dissolve NaOH), show calculation for theoretical ΔH to dissolve NaOH

statistics [compare ΔH to dissolve NaOH  theoretical versus experimental]

discussion (15 points)

hypothesis & basis  

what would be the accuracy in your determination of ΔH to dissolve NaOH

discussion

rationalize error in ΔH to dissolve NaOH

use statistics to support or refute your hypothesis; refer to p-value

 

resources

lab activity source (examples):  site 1  &  site 2  [access 4 / 2009]