Description
Please answer/solve all of the attached questions in the word document. They are focused on Mixtures, Solution Concentrations, and Dialysis.
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Explanation & Answer
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1. Complete this equation for the dissociation of CdCl2(aq). Omit water from the equation because
it is understood to be present.
CdCl2(aq)--> Cd2+ + 2Cl-
2. How many grams of CaCl2 are needed to make 965.1 g of a solution that is 31.5% (m/m)
calcium chloride in water? Note that mass is not technically the same thing as weight, but (m/m)
has the same meaning as (w/w).
mass:
304.007 g CaCl2
How many grams of water are needed to make this solution?
mass:
661.09 g H2O
3. What is the volume percent, % (v/v), of an alcohol solution made by dissolving 125 mL of
isopropyl alcohol in 765 mL of water? Assume that volumes are additive.
volume percent: 14.045
% (v/v)
The mass of solute per 100 mL of solution is abbreviated as % (m/v). The abbreviation % (w/v) is
also common. How many grams of sucrose are needed to make 920 mL of a 34.0% (w/v)
sucrose solution?
mass:
312.8
g sucrose
4. A fictional cubed-shaped bacterium, Bacterius cubis, occupies a volume of 1.0 femtoliters. This
particular type of bacteria is known to communicate with its own species by secreting a small molecule
called bactoX ( MW=112.0 g/mol ).
A. Each bacterium contains 4820 bactoX molecules that can be secreted. How many moles of bactoX
are present in a 1.6 μL sample volume that contains 7.664×106 bacterial cells?
moles:
6.133 x 10-14
mol
B. Calculate the molarity (mol/L) of bactoX in the 1.6 μL sample volume if all of the bacteria were to
simultaneously secrete all of the bactoX molecules contained within their cell bodies into the vial.
concentration: 3.833 x 10-8
M
C. Scientists discovered that bactoX will induce a luminescence response in B. cubis when the
concentration in a sample reaches 9.40×10−12 M. How many molecules of bactoX must be present in
solution to initiate luminescence in a 1.8 μL sample? How many individual bacteria cells does this
represent? The number of bactoX molecules per cell...