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Topic: energy released during crystallization  (Read 4238 times)

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Offline Dergyll

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energy released during crystallization
« on: May 31, 2008, 01:02:14 PM »
Hey guys, its me again with the acetate experiments.

I just made 2 different supersaturated solutions of sodium acetate and Zinc acetate. It is well known that when the two solutions crystallizes, energy is released. I used a thermometer to measure the temperature change from solution to solid crystal. My question is, why does the crystallization of sodium acetate release more energy than the crystallization of zinc acetate? (Sodium acetate had a greater Delta T and Delta H)

Thanks alot

Offline Mahmoud

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Re: energy released during crystallization
« Reply #1 on: June 11, 2008, 09:37:14 AM »
i think the answer is
                            Delta H = m Cp Delta T

so the difference in T ( u measured by thermometer ) is high in case of sodium acetate with using the same mass of both compounds .

and also if the specific heat of sod acetate is higher than zinc acetate the energy released will be higher , and if not the difference in T in case of sod acetate will be higher than Cp for zinc acetate ( i don't know which of them has higher Cp )

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