DIffusion and osmosis final

DIffusion and osmosis final - Part 1: Diffusion of a Gas in...

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Part 1: Diffusion of a Gas in a Gas a) distance of NH 4 Cl precipitate from NH 4 OH plug = 885mm b) distance of NH 4 Cl precipitate from HCl plug = 325mm c) ratio of d 1 /d 2 = 885/325 ratio = 2.7 a) diffusion rate for NH 3 , r 1 = 1/ MW 1 = .242 r 1 = 1/ 17 = .242 b) diffusion rate for HCl, r 2 = 1/ MW 2 =.166 r 2 = 1/ 36.5 = .166 c) Ratio r 1 /r 2 = 1.5 R 1 /R 2 = (.242/.166) = 1.5 1. Yes, the ratio of the distances is the same as the ratio of the molecular weights of the two gases. That is because the diffusion of the gases in the glass tubing is dependent upon molecular weight. The Kinetic energy of each gas particle is the same because temperature is the same; therefore the more massive particle will be traveling more slowly and diffusing more slowly than that of the larger particle. However according to the measurements that were obtained by the group members the ratio of the molecular weight do not match the ratio of distance, although in theory they have to be the same. 2. The white precipitate did not form at the center of the tube. It formed closer to the Hydrochloric Acid (HCl) end. HCl has approximately twice the molecular weight of ammonia, and the rate of diffusion is inversely proportional to the square root of the molecular mass of the gas. 3.
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This note was uploaded on 12/23/2010 for the course BIO 221 taught by Professor Net during the Spring '10 term at Cuyamaca College.

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DIffusion and osmosis final - Part 1: Diffusion of a Gas in...

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