Question

The random thermal motion of molecules from a region of higher concentration to a region of lower concentration is called diffusion. The rate of diffusion across a barrier is defined by Fick’s law of diffusion:_________

Answer 1

Answer:

$\frac{dq}{dt} =-DA\frac{dc}{dx}$

Explanation:

Fick's law of diffusion describes the times course of transfer of matter from a region of high concentration to a region of lower concentration separated by a thin barrier membrane.

Mathematically:

$\frac{dq}{dt} =-DA\frac{dc}{dx}$

where:

• q = quantity of solute
• t = time
• A = membrane surface area
• c = concentration
• D = diffusion coefficient
• dx = membrane thickness
• $\frac{dc}{dx}$ = concentration gradient