Hanna Week 2 Key x - IA Hanna Tran [email protected] Section...

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IA: Hanna Tran Section: Tue 6-6:50 APM 2301 [email protected] OH: Wed 1PM Hi Thai BIPN 100 PROBLEM SET: WEEK 2 KEY Topics: Diffusion and Osmosis Tonicity Ohm’s Law Fick’s Law of Diffusion Channels and Carriers Proteins DIFFUSION AND OSMOSIS 1. (a) What is diffusion ? How does it occur? What is the driving force? Diffusion : movement of particles from an area of higher concentration to an area of lower concentration. This occurs due to kinetic energy present in the gas and liquid molecules which allow it to constantly move randomly and disperse. The driving force is the concentration gradient, aka concentration difference of the particles (b) What is osmosis ? What is osmotic pressure ? Osmosis : diffusion of water; movement of water across a semi-permeable membrane driven by a difference in solute concentrations on two sides. Water moves from area of low solute concentration to area of high solute concentration. Osmotic pressure : pressure required to oppose 2. (a) What is osmolarity ? Osmolarity : number of osmotically active particles in a liter of solution (OsM or mOsM) (b) What are the osmolarities of the following particles? 200 mM glucose = _ 200 mOsm glucose 40 mM NaCl = _ 80 mOsm NaCl Why are the approaches to calculating osmolarities for these two particles different? In other words, how are these particles different? Glucose is an uncharged molecule, which is not osmotically active in water. However, NaCl dissociates into ions when placed in water, creating two particles: Na+ and Cl-. This is why you multiple NaCl’s molarity by 2 – to take into account the number of particles produced by NaCl when placed in water.
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