(PLEASE SHOW WORK) 3.) A saturated solution of strontium hydroxide is prepared i
ID: 774372 • Letter: #
Question
(PLEASE SHOW WORK)
3.) A saturated solution of strontium hydroxide is prepared in the excess solid Sr(OH)2 is allowed to settle. A 25.0mL aliquot of the saturated solution is withdrawn and transfer to an Erlenmeyer flask, and two drops of indicator are added. A 0.073M HCl solution (29.50mL) is used to titrate the hydroxide ion.
a.) How many moles of hydroxide ion are neutralized in the analysis?
b.) What is the molar concentration of the hydroxide ion in the saturated solution?
c.) What is the molar solubility of strontium hydroxide?
d.) What is the solubiliy product, Ksp, for strontium hydroxide?
Explanation / Answer
a - 0.101 mmole / ml HCl x 21.3 ml = mmoles acid needed to neutralize the solution;
b - therefore the amount of OH- in solution prior to neutralization is the exact same as the acid needed to neutralize it.
c - from the mmoles of OH- in the 25 ml sample you should easily be able to convert this to mmoles of strontium hydroxide as you should also know the formula of strontium hydroxide (a Group IIA element) - Sr(OH)2
d - Ksp = [Sr++][OH]^2 moles OH- calculated in a above; convert to moles / liter or mmoles / ml; Sr- is directly related to OH- from the formula
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