Record this more accurate value. Example might be 6.8. Check the results with the TA's data. Be sure your values are in the correct range. Your group will answer the review questions on pH for the entire class.
All molecules are in constant motion.
As molecules bump into each other, directions are changed, causing random dispersal of the molecules. The movie will show some indirect ways in which molecular motion can be observed. The random movement of molecules results in diffusion . X move away from the area of higher concentration because the molecules encounter fewer obstructing molecules in the area of lower concentration. The rate of diffusion is variable and depends on temperature, molecular weight, distance to travel, solvent density, and other factors.