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【单选题】
CaC 2 O 4 的 K sp = 2.6 ́ 10 -9  , 在含 0.020 mol·dm -3 Ca 2+ 的溶液中形成沉淀时 , 所需 离子浓度至少 ( )
A.
1.1 ´ 10 -9 mol·dm -3
B.
1.3 ´ 10 -7 mol·dm -3
C.
2.2 ´ 10 -5 mol·dm -3
D.
2.2 ´ 10 -7 mol·dm -3
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