Barium hydroxide is a base that is sometimes used for titrating acids. When using it, you need
Question:
Barium hydroxide is a base that is sometimes used for titrating acids. When using it, you need to know the actual concentration of hydroxide ion in the solution. What are the molar concentrations of H3O+ and OH– in 0.0030 m Ba(OH)2(aq) at 25°C?
ANTICIPATE Because the compound provides OH– ions, these ions will be present in overwhelming concentration, but nevertheless there must also be a tiny concentration of H3O+ ions to maintain the value of Kw.
PLAN Most hydroxides of Groups 1 and 2 can be treated as fully dissociated into ions in aqueous solution. Decide from the chemical formula how many OH– ions are provided by each formula unit and calculate the concentrations of these ions in the solution. To find the concentration of H3O+ ions, use the water autoprotolysis constant Kw = [H3O+][OH–].
Step by Step Answer:
Chemical Principles The Quest For Insight
ISBN: 9781464183959
7th Edition
Authors: Peter Atkins, Loretta Jones, Leroy Laverman