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Topic: Mass of Precipitate Question  (Read 6694 times)

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Offline Princezz3286

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Mass of Precipitate Question
« on: September 21, 2009, 03:14:50 PM »
If 3.5 mL of 1.0 M Ni(NO3)2 is added to 6.00 mL of Na2S, what is mass of precipitate would you expect to recover based on the plot you prepared?

Chemical equation: Ni(NO3)2 + Ni2S -----> 2NaNO3 + NiS

Please correct me if i'm wrong at any part in here...

Reaction Mix        1.00 M Ni(NO3)2                 1.00 M Na2S
                      Vol. mL       # mol              Vol. mL       # mol       mass of residue 
      1               1.0             .001               6.0           .006        .1023 
      2               2.0             .002               6.0           .006        .1814
      3               3.0             .003               6.0           .006        .2751
      4               4.0             .004               6.0           .006        .3524
      5               5.0             .005               6.0           .006        .4541
      6               6.0             .006               6.0           .006        .5444
      7              7.0              .007               6.0           .006        .5502
      8              8.o              .008               6.0           .006        .5493
      9              9.0              .009               6.0           .006        .5442

I just want to know if there is an easy way to calculate this and how, I would like to understand how to do it with the information on the table provided I dont just want an answer please.

Thanks!
         

Offline Dan

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Re: Mass of Precipitate Question
« Reply #1 on: September 22, 2009, 05:10:27 AM »
Well, first the question implies that you should plot the data, did you do that?
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Offline BluRay

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Re: Mass of Precipitate Question
« Reply #2 on: September 22, 2009, 03:01:20 PM »
I'd say linear interpolation; from the data in the table you find a and b in the equation y = a*x + b where x is the nichel nitrate solution volume and y the mass of residue. Then you substitute x = 3.5 and find y.

Offline Princezz3286

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Re: Mass of Precipitate Question
« Reply #3 on: September 28, 2009, 02:21:48 AM »
I was thrown off because there was no place to plot the points... just the data set I included.  She went over it in class.
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