Galvanic Cells: Pre-Lab Quiz Started: Nov 1 at 12:01pm Quiz Instructions You wil
ID: 552419 • Letter: G
Question
Galvanic Cells: Pre-Lab Quiz Started: Nov 1 at 12:01pm Quiz Instructions You will have 15 (yes, 15!) attempts at the quiz, with your highest score counting for credit DQuestion 4 1 pts Sally has constructed a concentration cell to measure Ksp for MCIar She constructs the cell by adding 2 mL of 0.05 M MINOs)n to one compartment of the microwell plate. She then makes a solution of MCI, by adding KCI to MINOalh She adds 2.117 mL of the resulting mixture to a second compartment of the microwell plate. Sally knows n (the charge on the metal ion)-+2 She has already calculated [Mn+] in the prepared MCl, solution using the Nernst equation.[Mn+] = 1.844 M How many moles of [CI'] must be dissolved in that compartment? (Hint: start by finding how many moles of [M") are dissolved in that mol compartment of the microwell plate) Provide your response to three digits after the decimal. Next . Previous Not saved Submit Quiz 12:04 PMExplanation / Answer
ANSWER:
Since the charge on M is +2 sothe molecular formulla of MCln is MCl2
Molarity of MCl2 solution = 1.844M
Out of this solution Safly takes out 2.117mL and adds to the compartment.
Hence moles of MCl2 = molarity of MCl2 X volume of MCl2 taken out = 1.844M X 2.117mL = 3.90 mmol
Each mole of MCl2 contain two moles of [Cl-],
hence moles of [Cl-] present in 3.90 mmol of MCl2 = 2 X 3.90mmol = 7.8 mmol.
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