Answer to Question #349488 in General Chemistry for hailey

Question

An aqueous solution of HCl is added to an aqueous solution of Na(OH) and a reaction occurs. The

concentration of H + ions in the solution is 1.0x10 -5 M, calculate the concentration of the OH –1 ions. Is the

solution more acidic or basic?

Answer 1

pH = -log [H⁺]

pOH = -log [OH^-]

in aqueous solution pH + pOH = 14

Using the above data, we find first the pH, then the pOH and then the OH^-concentration.

pH = -log (1*10^-5) = 5

pOH = 14 - pH = 14 - 5 = 9

pOH = -log [OH^-] = 9

[OH^-] = 1 * 10^-9 M

If the pH is higher than 7, the solution is alkaline; if it is less than 7, it is acidic; if it is equal to 7, it is neutral.

Answer:

[OH^-] = 1 * 10^-9

solution is a acidic.