在100ml含Cu2+、Al3+、NH4+、H+、NO3﹣的溶液中，逐滴加入2.5mol·L﹣1NaOH溶

在100ml含Cu²⁺、Al³⁺、NH₄⁺、H⁺、NO₃^﹣的溶液中，逐滴加入2.5mol·L^﹣1NaOH溶液，所加NaOH溶液的体积（ml）与产生沉淀的物质的量（mol）关系如图所示．下列叙述正确的是（　　）

A．x-y=2×10^-3mol

B．原溶液的pH=2

C．原溶液中n（Cu²⁺）=0.025mol

D．原溶液中c（NH₄⁺）=7.5×10^﹣³mol·L^-1

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在100ml含Cu2+、Al3+、NH4+、H+、NO3﹣的溶液中，逐滴加入2.5mol·L﹣1NaOH溶

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