Question

an aqueous solution of Ba(OH)2 by pipetting 25.00 mL of 0.0970 M Ba(NO3)2 into an Erlenmeyer flask and that contains 25.00 mL of 0.105 M KOH.

a) Calculate the molar concentrations of Ba2+(aq) and OH1-(aq) in their 50.00 mL solution.

b) Use the molar concentrations of Ba2+(aq) and OH1-(aq) as determined above and the Ksp to show why a precipitate does not form. You must include a calculation as part of your answer. The value of Ksp for Ba(OH)2, is 5.0 x 10-3.

c adds solid KOH to their solution of Ba(OH)2 until the hydroxide concentration, [OH1-], becomes 0.200 M. Assuming that the volume of the solution does not change, does the molar concentrations of Ba2+(aq) increase, decrease or remain the same? justify your answer.

Answer 1

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