Sally has constructed a concentration cell to measure Ksp for MCln. She construc

Question

Sally has constructed a concentration cell to measure Ksp for MCln. She constructs the cell by adding 2 mL of 0.05 M M(NO3)n to one compartment of the microwell plate.

She then makes a solution of MCln by adding KCl to M(NO3)n. She adds 4.782 mL of the resulting mixture to a second compartment of the microwell plate.

Sally knows n (the charge on the metal ion) = +3

She has already calculated [Mn+] in the prepared MCln solution using the Nernst equation. [Mn+] = 9.701 M

How many moles of [Cl-] must be dissolved in that compartment? _____ mol

(Hint: start by finding how many moles of [Mn+] are dissolved in that compartment of the microwell plate)

Provide your response to three digits after the decimal.

Explanation / Answer

As she knows that n = 3, them MnCln = MnCl3

In that compartment [Mnn+] = [Mn3+]= 9.701M

volume in that compartment = 4.782 mL

number of moles of Cl- = 3 x Mn2+ since there are 3 Cl for every 1 Mn3+

number of moles of Cl- = 3 x 9.710M x 4.782 mL x 10-3 L= 0.13929966 mol

moles of [Cl-] must be dissolved in that compartment = 0.139 mol (three digits after the decimal)

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