Concentration of solution

The pH of a buffer solution containing equimolar concentrations of solution acetate and acetric acid is equal to:

what is meant by the concentration of a solution ?

"Osmosis is flow of solution from higher concentration to solution of lower concentration through semi-permeable membrane" What is incorrect in the statements ?

The H^(+) ion concentration of a solution is 4 x 10^(-5) M. Then the OH^(-1) ion concentration of the same solution is

what is the most common way of expressing the concentration of a solution ?

The pH of which compound in aqueous solution depends on its concentration in solution ?

When concentration of solute is low in plant cell, absorpion of water is