A Student Determined the Equilibrium Concentration in the Following Equation $\frac { x ^ { 2 } } { ( 0.05 - x ) }$

question 9

Multiple Choice

A student determined the equilibrium concentration in the following equation by neglecting the x term in the denominator. Was she justified or not in this approximation and why?
K = 4.0 *10^-2 = $\frac { x ^ { 2 } } { ( 0.05 - x ) }$

• A) Yes, the concentration is much greater than K, so the x can be ignored.
• B) Yes, the value of x determined in this way is less than 0.05, so it can be ignored.
• C) No, the value of x determined in this way significantly reduces the denominator.
• D) No, the value of x can never be ignored in solving an algebra problem.
• E) No, the value of K is much less than 1, so x cannot be ignored.

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