Project #3492 - Chemisty

how do you measure freezing pint depresson?

 

1. fill 2 400 ml beakers with crushed ice add 50 Ml of cold tap water to each beaker

2. meausre the tempurature of each beaker using a non mercury thermometer

3. stir the contents of each beaker with a stirring rod until both beakers are at a constate tempurature aprx 1 minute record the temp

4. add 75g of rock salt NACl to one beaker.  ontinue to stiring both beakers. some of the salt will disolve

5. when the tempurature in each beaker is constant , record final reading.

 

questions:

1. compare your readings taken for the ice water and salt water.  Hoe do you explain the observed temp change?

2. explain why salt was added to only one of the beakers

3. salt is a strong electrolyte that produces two ions, Na+ and cl- when it dissociates in water. explain why this is important to consider when calcilating the colligative property of freezing point depression.

4. predict wheather it would be better to use coarse rock salt or fine table salt when making homemade ice cream. Explain?

 

I must have pictures of lab to send in with assignment

Subject Science
Due By (Pacific Time) 03/22/2013 12:00 am
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