Sally has constructed a concentration cell to measure K_sp for MCl_n. She constr

Question

Sally has constructed a concentration cell to measure K_sp for MCl_n. She constructs the cell by adding 2 mL of 0.05 M M(NO_3)_n to one compartment of the microwell plate. She then makes a solution of MCl_n by adding KCl to M(NO_3)_n. She adds 4.701 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 [M^n+] in the prepared MCl_n solution using the Nernst equation. [M^n+] = 7.873 M How many moles of [M^n+] must be dissolved in that compartment? _____ mol Provide your response to three digits after the decimal.

Explanation / Answer

Volume of solution = 4.701 mL. = 4.701/1000

= 0.004701 lit

Molarity ( concentration ) = 7.873 M

Now, Molarity = Moles / Volume

Therefore,

Moles = Molarity x Volume

= 7.873 M x 0.004701 lit

= 0.037 moles

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