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jools111
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Homework Statement
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
Homework 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
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!
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