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Reviewed CSCA Chemistry question · Easy

下列物质中,既能与稀硫酸反应放出气体,又能与氢氧化钠溶液反应放出气体的是?

  1. 氧化铝
  2. 碳酸氢钠
  3. 氯化铵
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Correct answer

A.

Principle or equation

铝是两性金属,既能与酸反应生成氢气,又能与强碱溶液反应生成氢气。

Why this answer is correct

铝与稀硫酸反应:2Al+3H2SO4=Al2(SO4)3+3H2↑;铝与氢氧化钠溶液反应:2Al+2NaOH+2H2O=2NaAlO2+3H2↑。氧化铝与酸或碱反应均生成盐和水,无气体;碳酸氢钠与酸反应生成CO2,但与碱反应不生成气体;氯化铵与碱反应生成NH3,但与酸不反应。

Example

将少量铝片分别投入稀盐酸和氢氧化钠溶液,均观察到有气泡产生。

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