A solution is prepared such that the initial concentration of A$2+$ is $1\mathrm{.}50\backslash$times $10-3$ M and the initial concentration of X is $4\mathrm{.}60\backslash$times $10-3$ M$.$ A$2+$ and X are allowed to react as shown below to establish equilibrium with the complex AX$2+.$ In a colorimetry experiment, the equilibrium concentration of the complex AX$2+$ is determined to be $8\mathrm{.}9\backslash$times $10-4$ M$.$

A$2+($aq$)+$ X $($aq$)$ AX$2+($aq$)$

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A$2+($aq$)+$ X $($aq$)$ AX$2+($aq$)$

Initial concentration

Change in concentration

Equilibrium concentration expression

Equilibrium concentration value