PRE-LABORATORY QUESTIONS EXPT. 8 CALORIMETRY: HRN FOR NEUTRALIZATION OF NITRIC A

Question

PRE-LABORATORY QUESTIONS EXPT. 8 CALORIMETRY: HRN FOR NEUTRALIZATION OF NITRIC ACID TO BE COMPLETED AND HANDED IN PRIOR TO THE START OF THE LABORATORY PERIOD. SHOW ALL WORK. 1. (0.75 point) Consider the neutralization of nitric acid, HNO(a) by sodium hydroxide, NaOH(aq) a. Write the molecular equation for this reaction b. Write the overall ionic equation for this reaction. c. Write the net ionic equation for this reaction. 2. (I point) 25.467 g of 1.0 M NaOH(ag) is mixed with 25.715 g of 1.0 M HNO,(ag) in a coffee cup calorimeter. The final temperature of the mixture is 28.1°C The initial temperature of the NaOH solution is 21.2 Use this information and Equation l to calculate gNo". Assume a specific heat of 4.184 J/g°C for the NaOH solution. a. The initial temperature of the HNO, solution is 21.8. Calculate qHNo, assuming a specific heat of 4.184 J/g. C b. (1 point) Using your results from Question 2, use Equation 3 to calculate 1hn for the neutralization of the nitric acid by the sodium hydroxide. 3.

Explanation / Answer

Ans 1 .

a) The molecular equation is given as :

HNO3 (aq) + NaOH (aq) = NaNO3 (aq) + H2O (l)

b) The ionic equation is given as :

H+(aq) + NO3- (aq) + Na+ (aq) + OH- (aq) = Na+ (aq) + OH- (aq) + H2O (l)

c) The net ionic equation is given as :

H+ (aq) + OH- (aq) = H2O (l)

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