Question

5 please

DATA TABLE Trial 2 Trial 1 Maximum temperature c) Initial temperature ('C) .0 Temperature change (aT)9.5 33, 5 o.K la. 7 DATA ANALYSIS 1. Write the balanced equation for the reaction of phosphoric acid and sodium hydroxide. 2. Use the equation below to calculate the amount of heat determining the mass, m, of the solution use 1.11 g/mL for the density. Use 4.18 J/(g.°C) as the specific heat, Cp, of the solut solution. 1.11 니.lfe SS. SK 1,11 Use the heat energy that you calculated in 2 above to determine the enthalpy change, M, for the reaction in terms of kJ/mol of phosphoric acid. This is your experimental value of AH 3. 03 % ks Use a table of standard thermodynamic data to calculate the AH of neutralization for 4. phoric acid. Consider this the accepted value of AH. How does your experimental value for AH compare to the accepted value? Calculate the percent discrepancy between the calculated (accepted) value of the AH of neutralization of HsPO, and your experimental value. 5. Advanced Chemistry with Vernier 26-

Answer 1

We can calculate the enthalpy change of the neutralisation process from the standard enthalpy of formation values. In this case we shall calculate the enthalpy change using the standard enthalpies of formation of water molecule from a proton and hydroxide ion. From the calculated value we can then calculate the percent discrepancy.

Since phosphasic acid seacti with sodium hydxoxide to qie naten, the net meacfon (neutralisation neaction)

Albo ence Thus一1 AH.on -to nevdralication iven eimental value and the expeum ould he

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