300 mL 2 mol·L硝酸与一定量的铝镁铁合金反应生成 3.36 L NO (标准状

300 mL 2 mol·L硝酸与一定量的铝镁铁合金反应生成 3.36 L NO (标准状况)

和铁盐、铝盐、镁盐等,再向反应后的溶液中加入 3 mol·L的NaOH 溶液,使铝镁铁

元素恰好全部转化为沉淀,则所加NaOH 溶液的体积是                 (    )

A. 150mL           B. 200 mL           C. 450 mL            D.无法计算

 

答案

A

解析:根据题意铝镁铁元素恰好全部转化为沉淀,此时溶液中只有NaNO3,由原子守恒得n

(NaNO3)=n(NaOH)=n(HNO3)-n(NO)=0.3x2-3.36/22.4=0.45mol,则NaOH溶液的体积

是0.45mol/3=0.15L。

 

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