Question

Why does water move along its concentration gradients?

Answer 1

There is an electrical gradient and there is a concentration gradient.

1.) Chemical gradient better known as concentration gradient is much more powerful and compelling than the electrical gradient.

2.) Water is a polar molecule, meaning one side it positively charged while the other is negatively charged. This polar charged molecule causes water to have a weaker electrical gradient, thus the water has to move on its concentration gradient.