将一定量的钠铝合金置于水中，合金全部溶解，得到20 mL pH=14的溶液

将一定量的钠铝合金置于水中，合金全部溶解，得到20 mL pH=14的溶液，然后用l mol·L^-1的盐酸滴定，至沉淀质量最大时，消耗盐酸40 mL，原合金中钠的质量为

A．0．46 g B．0．69 g C．0．92 g D．0．23 g．

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将一定量的钠铝合金置于水中，合金全部溶解，得到20 mL pH=14的溶液

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