When we used 0.010 M acetic acid, we found that the concentration of H⁺ was 4.0x10^-4 M.

HOAc		H+   +	OAc-
0.0096 M		4.0x10-4 M	4.0x10-4 M

If we double the concentration of acetic acid to 0.020 M what happens to the concentration of H⁺?

Less than double Doubles More than double