The concentration of a solution is 0.4 M . What does it mean ?

The concentration of a solution is 0.4M.What does it mean?

The hydrogen ion concentration of a solution is 0.01 M, What is P^(H) ?

If the H^+ concentration of an aqueous solution is 0.001 M, then the pOH of the solution would be

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

The H^(+) ion concentration of a solution is 4xx10^(-5) M. Then the OH^(-) ion concentration of the same solution is

The H ion concentration of a solution is 4.75xx10^(-5) M. Then the OH ion concentration of the same solution is