Chapter 8, Problem 90QAP

Consider a metal ion A²⁺ and its nitrate salt, In an experiment, 35.00 mL of a 0.217 M solution of A(NO₃)₂ is made to react with 25.00 mL of 0.195 M NaOH. A precipitate, A(OH)₂, forms. Along with the precipitation, the temperature increases from 24.8°C to 28.2°C. What is ΔH for the precipitation of A(OH)₂? The following assumptions can be made.

• The density of the solution is 1.00 g/mL.

• Volumes are additive.

• The specific heat of the solution is 4.18 J/g $\cdot$

°C.