Solution A has a pH of 5, and solution B has a pH of 11. If equal amounts of A and B are mixed, is the resulting solution acidic or basic?
You can do this by reasoning or by calculation. Here is the calcn.
Take 1 L of each.
moles A = L x M = 1 L x 1 x 10^-5 M = 1 x 10^-5 moles.
moles B = 1L x 1 x 10^-11 M = 1 x 10^-11 moles.
moles A + moles B = [(1 x 10^-5) + (1 x 10^-11)] = 1 x 10^-5 moles. Total volume is 2 L.
M = moles/L = 1 x 10^-5/2 = 5 x 10^-6 M so the solution is _________.