1. The problem statement, all variables and given/known data I am working on a lab that has me a little confused: I diluted 5.5g of NaOH into 200ml of water to disassociate the sodium ions. In the equation below you can see my temperature results. Write the net ionic equation for the reaction, and note the value of ΔH. NaOH ---> Na + OH 2. Relevant equations ΔH = m•ΔT•Q ΔH = (200 g + 5.5 g)(final temp - initial temp)(4.18 J/g°C) ΔH = (205.5 g)(41 °C - 26 °C)(4.18 J/g°C) ΔH = 12.9 kJ 3. The attempt at a solution Because it's an exothermic reaction (It created heat....), I know ΔH should be negative. Why is it coming up positive? I'm lost here... I'm pretty sure I've done everything correctly. Thanks!