Help me out with this questions.. Post-Lab Questions I. In the Calculations sect

Question

Help me out with this questions..

Post-Lab Questions I. In the Calculations section you were asked to calculate the percent error in contribute to Law termination. Discuss at least two possible sources of error that could your percent error. 2. A student is performing Part c and does not completely dissolve the NaoH pellets before acquiring the final temperature. How will this affect his value for AHR and his percent error calculations 3. In a different experiment it is observed that 252 J of heat must be absorbed to raise the temperature of 50.0 g of Ni(s) from 20.0 "c to 31.4 C. Calculate the specific heat of Ni in both J g °C and call g oC. 4. For the three reactions studied in this experiment, demonstrate how the third reactian is the sum of the first two reactions. Which species out"?

Explanation / Answer

1. Errors in the experiment may arise due to inccorectly measuring the initial volumes of the solutions and by incorrectly measuring the temperature both initial and final or any one of them.

2. If not all of NaOH has dissolved, dHneut would be lower than the actual value expected as the final temperature would be lower due to less amount of acid neutralized.

3. Specific heat of nickel = heat/mass x dT

                                        = 252 J/50 g x (31.4 - 20.0)

                                        = 0.442 J/g.oC

                                        = 0.442 x 0.24

                                        = 0.106 cal/g.oC

4) dHreaction is derrived from heat required to dissolve substance and heat of neutralization of salt formed. So as the substance dissolves it relased heat which is higher than heat released when neutralization occurs. Thus from the two heat of reaction can be easily calculated.

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