TH FR 3 Heat of Neutralization Post-Laboratory Questions (Use the spaces provide
ID: 548679 • Letter: T
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TH FR 3 Heat of Neutralization Post-Laboratory Questions (Use the spaces provided for the answer and additional paper if necessary) 93 1. A student was given only one graduated cylinder 3. The accepted &Heuem; of hydrobromic acid (HBr) to use for this experiment. After using it to measure reacting with NaOH solution and of HNO, reacting with 50.0mlof the assigned acid, the student failed to rinse potassium hydroxide (KOH) solution are identical. or dry the cylinder before measuring out the 50.5mL of the base. Would the calculated AHneutzn be higher, ous HBr and HNO3 have in common. lower, or the same as the literature 'heutzn? Briefly explain this difference as a result of using only one graduated cylinder for the experiment (1) Write net ionic equations to show what aque- State what aqueous NaOH and KOH have in (2) common. 2. Explain how the following changes in the proce- dure for this experiment would affect the resuts. (1) A glass beaker was used instead of a pressed cup. (3) Explain why you would expect that AHneutan for HBr reacting with NaOH solution and houmfor HNOg reacting with KOH solution would be identical. Write ap- propriate equations to support this explanation. (2) A pressed polystyrene top was used to cover the polystyrene cup after the acid and base solutions had been mixed. name section datoExplanation / Answer
Q1
V = 50 mL of acid
but V = 50.5 mL of base
when we use
Hneutralized
note that moles of acid/base are the SAME
will not chang eis excess is added
what it DOES changes
is the temperature of solution
Q = m*C*(Tf-Ti)
recall that Q, c and Ti are fixed
but noow mass increases, since totla mass is not 100 but 100.5
there will be a small amount of change
therefore
HRxn = decreases
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