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Secretary

Location:
Ashburn, Virginia, United States
Salary:
$15
Posted:
August 30, 2017

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Objective ( part * T o s et u p a c offee c up c alorimeter a nd d etermine i ts s pecific h eat c apacity Procedure ( part 1 ):

1. Stack 2 f oam c ups i n a 4 00 m L b eaker. 2. Using a g raduated c ylinder, p our o ut 5 0.0 m L o f r oom t emperature w ater a nd p our i t i nto the c offee c up c alorimeter.

3. Put t he l id o n t he c alorimeter, m aking s ure t here i s a n o pening f or a t hermometer. 4. Measure t his w ater’s t emperature a s t he i nitial t emperature f or t he c old w ater. 5. Heat 1 00.0 m L o f w ater i n a b eaker u ntil i t i s a t l east 3 0 d egrees C elcius m ore t han t he initial t emperature f or t he c old w ater.

6. Pour o ut 5 0 m L f rom t his b eaker i nto t he r emaining f oam c up. M easure t he t emperature of t his w ater a s t he i nitial t emperature o f t he w arm w ater. 7. Mix t he w arm w ater i nto t he c old w ater i n t he c alorimeter. C lose t he l id a nd u se t he thermometer t o r ecord t he t emperature o f t he m ixture e very 1 0 s econds f or a m inute a nd a h alf.

Objective ( parts 2 a nd 3 t o d etermine t he e nthalpy o f s alt s olutions Procedure ( part 2 a nd 3 ):

1. Use a g raduated c ylinder t o p our o ut 1 00.0 m L o f w ater i nto t he c alorimeter. C over i t w ith a l id a nd s tick i n a t hermometer. N ote d own t he t emperature i n t he d ata t able. 2. Mix i n 5 .00 g C aCl2 t o t he c alorimeter. W ait a f ew m inutes a nd t hen n ote d own t he highest t emperature a s t he f inal t emperature i n t he d ata t able. 3. Clean o ut t he c alorimeter a nd r epeat t he s teps w ith 1 0 g a nd t hen 1 5 g . 4. Repeat s teps 1 -4, e xcept w ith N H4Cl. N ote d own t he l owest t emperature a s t he f inal temperature i n t he d ata t able.

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