Bit confused about this question. especially a and b. Not really sure which values to use or how.

Question

Thanks!

A solution is made by dissolving 1.71g of barium hydroxide, Ba(OH)2 (s), in distilled water and then adding more distilled water until the total volume of the solution is one litre (1.00dm3). Calculate:

(a)the molarity of the barium hydroxide solution
(b)the hydroxide concentration in mol dm^-3
(c)the pOH of the solution
(d)the pH of the solution

Answer 1

a. molarity is defined as # moles/L solution. To find # moles, grams/molar mass.
b. Look at the formula. There are two OH ions per Ba(OH)2 molecules; therefore, the concn of OH must be twice the answer to a.
c. pOH = -log(OH). You have the OH from part b.
d. pH + pOH = 14. You have pOH from c, the only unknown is pH.
Post your work if you get stuck.