Answer to Question #349489 in General Chemistry for hailey

Question

An aqueous solution of H 2 (CO 3 ) is added to an aqueous solution of Li(OH) and a reaction occurs. The

concentration of (OH) - is 3.75x10 -5 M. Calculate the concentration of the H 3 O +1 ions. Is the solution

more acidic or basic?

Answer 1

pH = -log [H₃O⁺]

pOH = -log [OH^-]

in aqueous solution pH + pOH = 14

Using the above data, we find first the pOH, then the pH and then the H₃O⁺ concentration.

pOH = -log (3,75*10^-5) = 5- log(3,75) = 4,426

pH = 14 - pOH = 14 - 4,426 = 9,574

pH = -log [H₃O⁺] = 9,574

[H₃O⁺] = 2,667 * 10^-10 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:

[H₃O⁺] = * 10^-10

solution is a more basic