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What is Photosynthesis ?

By Sachin Joshi
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ACIDS - BASES REACTS WITH METALS.

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By Sachin Joshi

 

                          


• When Acids reacts with Metal. 

->  Acid + Metal ---------> Salt + Hydrogen gas.

-> When Acids react with Metals it gives salt and liberate hydrogen gas.

Example:-

i) 2HCl (l)+ 2Na(s) ---------> 2NaCl(s)+ H2(g)

ii) H2SO4 (l) + Mg (s) ----------> MgSO4(s) + H2 (g) 

iii) 2CH3COOH (l) + 2Na(s) -------> 2CH3COONa (s) + H2 (g)

• When Bases reacts with Metals:

-> When bases reacts with metals it gives salt and Hydrogen gas .

Base + Metal ---------> Salt + Hydrogen gas

Example:- 

I) 2NaOH (aq) + Zn (s) ----------> Na2ZnO2 (s) + H2 (s)

II) NaOH (aq) + Al (s)  ----------> NaAlO2 + H2 (s)

• Metal carbonate and metal hydrogen carbonate reacts with acids.

-> When Metal carbonate/ Metal hydrogen carbonate reacts with acids to give Salt, Water and  releases Carbon dioxide gas.

Metal carbonate/Metal hydrogen carbonate + Acid ------> Salt + Carbon dioxide + Water

Na2CO3 (s) + 2 HCl (aq) --------> 2NaCl (aq) + H2O (l) + CO2 (g).

NaHCO3 (s) HCl (aq) -------> NaCl (aq) + H2O (l) + CO2 (g).

Passing carbon dioxide gase through lime water 'Ca(OH) '.

Ca(OH)2 (aq) + CO2 (g) --------> CaCO3 (s) + H2O (l)

( Lime water)                       ( white precipitate)

On passing excess carbon dioxide the following reaction occurs:

- >On passing excess of carbon dioxide to the product it gives Calcium hydrogen carbonate.

CaCO3 (s) + H2O (l) + CO2 (g) --------> Ca(HCO3)2 (aq)

• Forms of Calcium carbonate.

-> Calcium carbonate found in different forms as. Limestone, chalk and marble.



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