______ M _______ M Titration to Determine the Ksp A saturated solution of an unk

Question

______ M

_______ M

Titration to Determine the Ksp

A saturated solution of an unknown metal (III) hydroxide was filtered to remove any excess solids. Then a 11.00 mL sample of the saturated solution was titrated to the end point with a 0.24 M solution of HCl.

If it took 14.20 mL of HCl to titrate to the endpoint,
a) What is the molar concentration of hydroxide ion in the saturated solution?

______ M

b) What is the molar concentration of the unknown metal (III) cation in the saturated solution?

_______ M

c) What is the Ksp for this unknown metal (III) hydroxide?
06 HCI used as the titrant * Titration of filtered saturated solution 1 Filtered saturated Willutill

Explanation / Answer

a) M(OH)3(aq) + 3HCl(aq) -----> MCl3(aq) + 3H2O(l)

No of mol of HCl reacted = V*M

               = 14.2*0.24

               = 3.408 mmol

No of mol of M(OH)3 reacted = 3.408/2 = 1.704 mmol

concentration of OH- ions = n/V

                          = 1.704*3/11

                          = 0.465 M
b)
concentration of M3+ ions = n/V

                          = 1.704/11

                          = 0.155 M

c) Ksp = [M3+][OH-]^3

    = 0.465^3*0.155

    = 0.0156

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