Homework Help: Chemistry

Posted by Anonymous on Sunday, November 8, 2009 at 9:28pm.

A student recorded the following data for copper sulfate pentahydrate.
Weight of crucible and cover (after heating to constant weight), 28.120g
Weight of covered crucible plus sample, 31.020g
Weight of covered crucible plus sample after heating to constant weight, 30.020g
calculate the percentage of water in the hydrate. determine experimental error

%water in hydrate=48.5%

now what? how do i determine %water in hydrate from the given data? and then find the error?

Chemistry - bobpursley, Sunday, November 8, 2009 at 9:36pm
Yes, determine the % from the data, then find error.
Chemistry - Anonymous, Sunday, November 8, 2009 at 9:39pm
I don't understand how to determine the % from the data...
Chemistry - DrBob222, Sunday, November 8, 2009 at 10:11pm
What's the 48.5%?
mass hydrated sample = 31.020-28.120 = ??
mass water = 31.020-30.020 = ??

%H2O = [mass water/mass hydrate ]*100 = ??
Check my numbers carefully.
Chemistry - c, Sunday, November 8, 2009 at 10:34pm
34.48%, percentage water of hydrate, final answer?
Chemistry - DrBob222, Monday, November 9, 2009 at 12:06am
right. 34.48% water.
I assume this is an experiment you did. Theoretical number is
[5*18.015/249.686]*100 = 36.08%.
Pretty good. Less than 5% error.

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