Buy Tonicity Moles and Osmoles Assignment

Buy Tonicity Moles and Osmoles Assignment
Buy Tonicity Moles and Osmoles Assignment
1. What information does the molarity of a solution provide?
A. The density of a solution
B. The number of dissolved particles per litre of solution
C. The mass of a mole of the substance
D. The tonicity of the solution
Answer is B: If molarity is 1.2 mmol/L = 1.2×10−3×(6.02×1023) particles per litre.
2. What term is applied to an intravenous solution that would cause a net movement
of water out of red blood cells?
A. Hypertonic
B. Supertonic
C. Hypotonic
4.4 Tonicity, Moles and Osmoles
Buy Tonicity Moles and Osmoles Assignment
Answer is A: “Hyper-” refers to greater (tonicity) than inside a RBC. Hence water
would move from the less concentrated solution (within the RBC) to the exterior.
3. What is a definition of an osmole? The amount of substance that:
A. Must be dissolved to produce 6 × 1023 solute particles
B. Must be dissolved to produce an osmotic pressure of 1.0 mmHg
C. Must be dissolved to produce an isotonic solution
D. Contains 6×1023 particles
Answer is A: Ionic substances (e.g. Na Cl−) separate into ions when dissolved.
Hence a mole of NaCl would produce two osmoles of ions (1 mol of Na ions and
1 mol of Cl ions). Hence half of a mole of NaCl, when dissolved, would result in
one osmole of dissolved particles (ions).
4. Choose the solution below that has the lowest concentration of dissolved
A. 0.9% NaCl
B. Isotonic powerade
C. 5% glucose
D. Hypotonic saline
Answer is D: Choices A, B and C are all isotonic solutions. “Hypo-” refers to a solution concentration that is less than that of human blood.
5. What can be correctly said of an isotonic intravenous solution? An isotonic
A. Causes water to move out of red blood cells
B. Causes no net movement of water into or out of red blood cells
C. Has the same solutes in the same solution concentration as blood plasma
D. Causes water to move into red blood cells
Answer is B: Isotonic means that the IV solution has the same concentration of
particles (albeit the particles themselves may be different) as in RBC; hence there is
no net osmotic flow.
6. What would be the concentration of a solution that causes red blood cells placed
in it to swell?
A. Hypotonic
B. Isotonic
C. Hypertonic
D. Iso-osmotic
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