Reversible Reactions and Equilibrium — Quiz

Question 7 • Chemistry

Which represents the correct equilibrium constant expression for the reaction below? Cu times s plus 2 Ag raised to the plus aq power long left right arrow Cu raised to the 2 plus power times aq plus 2 Ag s

Answer

cap k sub e q is equal to the fraction with numerator open bracket Cu raised to the 2 plus power close bracket times Ag squared and denominator Cu times open bracket Ag raised to the plus power close bracket squared

cap k sub e q is equal to the fraction with numerator Cu times open bracket Ag raised to the plus power close bracket squared and denominator open bracket Cu raised to the 2 plus power close bracket times Ag squared

cap k sub e q is equal to the fraction with numerator open paren Cu raised to the 2 plus power close paren and denominator open bracket Ag raised to the plus power close bracket squared

cap k sub e q is equal to the fraction with numerator open bracket Ag raised to the plus power close bracket squared and denominator open paren Cu raised to the 2 plus power close paren

Explanation

For an equilibrium expression, include aqueous species but omit pure solids. In Cu(s) + 2 Ag⁺(aq) ⇌ Cu²⁺(aq) + 2 Ag(s), both Cu(s) and Ag(s) are omitted. The coefficient 2 on Ag⁺ becomes an exponent, so K_eq = [Cu²⁺]/[Ag⁺]², which is choice C.

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