A Mining Operation Needs to Separate Silver and Copper

question 28

Multiple Choice

A mining operation needs to separate silver and copper. You are hired as a summer intern in a beautiful Colorado mining town, and one of your tasks is to determine whether this separation can be accomplished by oxidizing the metals to Ag⁺ and Cu⁺, each one at a concentration of 0.15 M, and then precipitate one as the chloride salt without precipitate the other. AgCl precipitates first. What is the concentration of the Ag⁺ remaining in solution when CuCl begins to precipitate? For AgCl, pK_sp = 9.74. and for CuCl, pK_sp = 6.76.

• A) 1.57  10^-2 M
• B) 1.57  10^-4 M
• C) 2.23  10^-2 M
• D) 2.23  10^-4 M
• E) 3.72  10^-3 M

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Definitions:

IFRS

International Financial Reporting Standards are worldwide guidelines for accounting, utilized in the creation of financial statements.

Depreciation

Apportioning the cost of a tangible asset in a systematic way over its period of usefulness.

Adjusted Trial Balance

A list of all accounts and their balances after adjustments are made for accruals, deferrals, and errors, ensuring the total debits equal the total credits.

Accounting Period

The period of time covered by financial statements, usually consisting of 12 months, but can be of any length according to the business's reporting requirements.