A Solution Contains 0

question 55

Multiple Choice

A solution contains 0.021 mol L^-1 Cl⁻ and 0.017 mol L^-1 I⁻. A solution containing copper(I) ions is added to selectively precipitate one of the ions. At what concentration of copper(I) ion will a precipitate begin to form? What is the identity of the precipitate? K_sp(CuCl) = 1.0 × 10^-6, K_sp(CuI) = 5.1 × 10^-12.

• A) 3.0 × 10^-10 mol L^-1, CuI
• B) 3.0 × 10^-10 mol L^-1, CuCl
• C) 4.8 × 10^-5 mol L^-1, CuCl
• D) 4.8 × 10^-5 mol L^-1, CuI
• E) 3.0 × 10^-5 mol L^-1, both CuCl and CuI are in the precipitate

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Definitions:

Pronator Teres

A muscle in the forearm that helps rotate the arm inward and bend the forearm at the elbow.

Subscapularis

A muscle in the shoulder that is part of the rotator cuff, responsible for medially rotating the arm.

Brachialis

A muscle in the upper arm that flexes the elbow joint, positioned beneath the biceps.

Levator Scapulae

A skeletal muscle located at the back and side of the neck, responsible for elevating the scapula (shoulder blade).