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不对称电位的存在主要是由于电极制作工艺上的差异。 ( )

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用库仑滴定法测定水中钙的质量浓度。在50.00mL氨性试液中加入过量的HgNH₃Y^2-，使其电解产生的Y^4-来滴定Ca²⁺，若电流强度为0.0200A，则到达终点需要3.20min，计算水中CaCO₃的质量浓度为多少(以mg·mL^-1为单位。)？电解产生Y^4-的电极反应为
HgNH₃Y^2-+NH⁺₄+2e^-→Hg+2NH₃+HY^3-

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在控制阴极电位电解过程中，随着金属离子的析出，金属离子浓度与时间的关系式为______。

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电解一价阳离子成为金属在阴极上析出时，若电解至尚剩下0.01%时视为已电解完全，则阴极电位值的变化为多少？

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A.Her present was a surprise to him,B.He had hoped the gift would surprise her.

A. Her present was a surprise to him,
B. He had hoped the gift would surprise her.
C. She wasnt surprised by the gift after all.
D. He didnt know about the surprise party either.

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