metals generally do not give hydrogen gas when react with HNO3 why
Answers
Answered by
6
Heya
Here's your answer !!
Generally when metals are treated with mineral acids hydrogen gas is liberated but when metals (except Mn and Mg) are treated with HNO3 , hydrogen is not liberated.
This is because Nitric acid ( HNO3 ) is a powerful oxidising agent , and the oxygen formed due to its decomposition oxidises the hydrogen to give water thus defeating the purpose of the reaction .
3Zn + 8HNO3 -----> 3Zn(NO3)2 + 4H20 + 2NO (g) .
Even Magnesium and manganese react with very dilute nitric acid ( 1% nitric acid ) to liberate hydrogen . The oxidising action of the acid is much reduced due to its over dilution .
Mg + 2HNO3 ----> Mg(NO3)2 + H2 (g) .
Hope it helps !!
Here's your answer !!
Generally when metals are treated with mineral acids hydrogen gas is liberated but when metals (except Mn and Mg) are treated with HNO3 , hydrogen is not liberated.
This is because Nitric acid ( HNO3 ) is a powerful oxidising agent , and the oxygen formed due to its decomposition oxidises the hydrogen to give water thus defeating the purpose of the reaction .
3Zn + 8HNO3 -----> 3Zn(NO3)2 + 4H20 + 2NO (g) .
Even Magnesium and manganese react with very dilute nitric acid ( 1% nitric acid ) to liberate hydrogen . The oxidising action of the acid is much reduced due to its over dilution .
Mg + 2HNO3 ----> Mg(NO3)2 + H2 (g) .
Hope it helps !!
Similar questions