Question

factors affecting rate of diffusion
rate of diffusion is affected by different factors. of the situations below, predict which one would have the fastest rate of diffusion.
multiple choice
methylene blue (molecular weight = 320) that is highly concentrated in a liquid
congo red that is highly concentrated in a semisolid
congo red (mw = 697) that is highly concentrated in a liquid
methylene blue that is highly concentrated in a semisolid

Explanation:

Diffusion rate is affected by molecular weight and medium. Smaller - sized molecules (lower molecular weight) diffuse faster, and diffusion is faster in liquids than in semi - solids. Methylene blue has a lower molecular weight (320) compared to Congo red (697), and diffusion in a liquid is faster than in a semi - solid. So, methylene blue that is highly concentrated in a liquid would have the fastest rate of diffusion.

Answer:

methylene blue (molecular weight = 320) that is highly concentrated in a liquid