If 0.015 mg Pb2+ were added to enough water to make exactly

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If 0.015 mg Pb2+ were added to enough water to make exactly 1 L of solution, the solution would be?
问题应该是这样的：the solution would be（） in Pb2+
选项是：
a. 7.2x10-3
b. 1.5x10-5
c. 7.2x10-8
d. 1.5x10-8
e. 7.2x10-5
f. 7.2x103
g. 0.015 M
谁可以告诉我解答过程？谢～

0.0015*10^(-3)/207.2=7.2*10^(-8)mol
由于容易体积为1L
那么Pb2+离子浓度为7.2*10^(-8)mol/L

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