Posted by Micheal on Friday, November 8, 2013 at 9:32pm.
I got part a but part b I'm having trouble with I keep getting 56.2mL.
I'm not sure what the next step is really to find part b.
A. How would you prepare 250 mL of a 0.150 M solution of CoCl2 from solid CoCl2 and distilled water?
Dissolve 4.87 grams solid CoCl2 into enough water to make 250mL of solution using a volumetric flask.
b. Using the solution prepared in part a and distilled water, how would you prepare 100 mL of a 0.0600 M solution of CoCl2?
Measure mL of the 0.150 M CoCl2 solution using a volumetric pipet into a volumetric flask and add enough water to bring the solution level up to the line.

Chem  bobpursley, Friday, November 8, 2013 at 9:56pm
.150 to .06 is diluting it 150/6 times, or 25 tims. diluting something 25 times means 1 part base solution, adding 24 parts water.
you want 250ml, so one part is 10ml
take one part (10ml) of .150M, add 240ml of water, stir, and label.

Chem  DrBob222, Friday, November 8, 2013 at 10:18pm
I believe Mr. Pursley meant .150 to .06 is 15.0/6 = diluting 2.5 times. Just a typo.
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