A Solution Contains 0

question 60

Multiple Choice

A solution contains 0.036 mol L^-1 Cu²⁺ and 0.044 mol L^-1 Fe²⁺. A solution containing sulfide ions is added to selectively precipitate one of the metal ions from solution. At what concentration of sulfide ion will a precipitate begin to form? What is the identity of the precipitate? K_sp(CuS) = 1.3 × 10^-36, K_sp(FeS) = 6.3 × 10^-18.

• A) 1.4 × 10^-16 mol L^-1, FeS
• B) 3.6 × 10^-35 mol L^-1, CuS
• C) 3.6 × 10^-35 mol L^-1, FeS
• D) 1.4 × 10^-16 mol L^-1, CuS
• E) 1.4 × 10^-16 mol L^-1, both CuS and FeS will precipitate

---

Definitions:

Actual Reserves

The physical amount of a commodity or cash held as reserves in a financial institution or by an organization.

Monetary Policy

Measures undertaken by a government's central bank to regulate the economy's money supply and interest rates to achieve macroeconomic objectives like controlling inflation, consumption, growth, and liquidity.

President

The head of state and government in a republic, often elected to lead the executive branch and uphold the laws and constitution of the nation.

Monetary Policy

Actions undertaken by a central bank, such as managing interest rates and controlling the money supply, to influence economic activity.