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Luke J.

asked • 08/17/16

Concentration with Uncertainty

Timothy has 1 gallon of 6% bleach, assume 94% is water.
Timothy decides to dilute the bleach separately. Timothy
pours 10mL+0.1, 9mL+0.1, 8mL+0.1, 7mL+0.1, 6mL+0.1, and 1mL+0.1, of the bleach
into 6 different containers and then fills the difference
to 10mL with water. Calculate the new concentration, in moles per decimeter cubed, of the
bleach in each container.

Julie S.

Luke - You need more info, at least the density of the bleach solution.  If you want any sort of error calculation, you need more info about the final 10 mL also.  Is it a graduated cylinder or a volumetric flask?  What's the error in the 10 mL final volume?
If the 10 mL final volume is assumed to be "exact" and the only error is in the original quantities, then the only missing piece of information is the bleach density.  You can't go from % by mass to anything to do with moles unless we know the mass of the solution.  You are measuring the volume of the solution, so you need the density to get to mass!


Luke J.

The density of the bleach is 1.11 g/cm3, and the 10mL is measured in a graduated cylinder.


1 Expert Answer


Julie S. answered • 08/18/16

5.0 (379)

Master's in Chemistry with 20+ Years of Teaching/Tutoring Experience

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