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What will be the reaction between metals like sodium, potassium and calcium with cold water?

Asked by Topperlearning User 28th September 2016, 4:05 PM
Answered by Expert
Answer:

Metals react with cold water to form metal hydroxide and liberate hydrogen gas.

Sodium        

2Na + 2H2O → 2NaOH + H2

The reaction is violent but comparatively less violent than potassium. Sodium melts into a silvery globule and darts about the water.

Potassium

2K + 2H2O → 2KOH + H2↑         

The reaction is violent and exothermic. The heat liberated during the reaction ignites hydrogen.

Calcium 

Ca + 2H2O → Ca(OH)2 + H2

The reaction is slightly vigorous, but calcium is quite expensive. Hence, it is economically not viable.

 

Answered by Expert 28th September 2016, 6:05 PM
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