Given the following reactions:
$Ag^{+} + NH_3 \rightleftharpoons [Ag(NH_3)]^+ ; K_1 = 1.6 \times 10^3$
$[Ag(NH_3)]^+ + NH_3 \rightleftharpoons [Ag(NH_3)_2]^+ ; K_2 = 6.8 \times 10^3$
What is the formation constant for $[Ag(NH_3)_2]^+$?

  • A
    $1.088 \times 10^7$
  • B
    $1.08 \times 10^7$
  • C
    $1.08 \times 10^3$
  • D
    $3.8 \times 10^5$

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