Answer to Question #142924 in General Chemistry for Duke Cliffton

Question

Consider the neutralization of nitric acid, HNO3(aq) by sodium hydroxide, NaOH(aq).

1.) 26.167 g of 1.0 M NaOH(aq) is mixed with 25.715 g of 1.0 M HNO3(aq) in a coffee cup calorimeter. The final temperature of the mixture is 28.1°C.

a. The initial temperature of the NaOH solution is 21.2°C. Use this information to calculate qNaOH. Assume a specific heat of 4.184 J/g∙°C for the NaOH solution.

b. The initial temperature of the HNO3 solution is 21.8°C. Calculate qHNO3, assuming a specific heat of 4.184 J/g∙°C.

Answer 1

a. Q=mcΔT

Q_NaOH= 26.167g × 4.184J/g.°C × (28.1-21.2)C

Q_NaOH= 26.167g × 4.184J/g.°C × 6.9°C

Q_NaOH= 755.43J

b. Q= mcΔT

Q_HCl= 25.715g × 4.184J/g°C × (28.1-21.8)°C

Q_HCl= 25.715g × 4.184J/g°C ×6.3°C

Q_HCl = 677.83J