Questions 15-18 pertain to the same solution that is 0.927 M in sodium telluride (Na?Te).
The concentration of fully-protonated hydrogen telluride (H?Te) is abbreviated as [H2A], that of the monoprotic conjugate base (HTe¯) is [HA?], and that of
telluride (Te?²) is [A²?].
H?Te:
$K_{a1} = 2.5 \times 10^{-3}$
$K_{a2} = 1.0 \times 10^{-11}$
What is the equilibrium concentration of [A²?]? (3 sf)
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