Lab Report A. Determining AHnen for an acid-base neutralization reaction Report
ID: 514378 • Letter: L
Question
Lab Report A. Determining AHnen for an acid-base neutralization reaction Report and analyze your data HCI data mass coffee cup S.2S mass cup HCl solution mass HCI solution initial temperature of HC1 volume of HCI Molarity of HCI moles HCl added NaOH data mass coffee cup mass cup NaOH solution Sb.86 mass NaOH solution initial temperature of NaOH 24 as volume of NaOH 24 yo M 1.32 lo-ost: te. Molarity of NaOH moles NaOH added Reaction data. total mass of mixed solutions lay. 936 initial temperature of solution a1.7s (f HCl and NaOH differ by more than 0.1 ec, show the weighted average calculation final temperature of solution 33. o 12.45 1 21.ns 12-15 AT of solution (for actual amount of NaOH and HCl added) 162Explanation / Answer
qsolvent = M*Cp*dT
M = mixture mass, Cp = specific heat capacity of solution ( assume it to be equal to that of water which is 4.18 J/(g.0C) ), dT = temp change
dHrxn = 1.32*(-57.6) kJ = -76.032 kJ
Balanced thermochemical eqn:
HCl + NaOH ----> NaCl + H2O ; dHrxn = -76.032 kJ
Qwater = M*Cp*dT
M = water mass, Cp = specific heat capacity of water, equal to 4.18 J/(g.0C), dT = temp change
Similar equation holds for Qice, except that for ice, Cp = 2.108 J/(g.0C)
Sources of error are:
(i) Heat lost to the surroundings ( e.g., via convection) are not taken into account
(ii) Heat absorbed by the cup is also not considered, since the cup is not perfectly insulating
Heat of vaporization is much greater than heat of fusion because the energy required to break apart the molecules in liquid and set them free as gaseous molecules is much greater than that required to just bring them into mobile phase from solid phase.
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