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What is the net ionic equation for the reactions of:
a.) magnesium metal and acetic acid
b.) acetic acid and ammonia solution
My answers were :
a.) Mg(s) + 2H+ (aq) -> Mg2+ (aq) + H2 (g)
b.) H+ (aq) + NH3(aq) -> NH4+ (aq)
Apparently these answers are wrong. Can someone please explain to me why?Please respond ASAP!
1 Answer | Add Yours
When magnesium metal reacts with acetic acid (CH3CO2H, a weak acid), magnesium acetate (a salt) and hydrogen gas is produced. The salt, Mg(CH3CO2)2 is soluble in water because all acetates are soluble. Thus, the complete equation is:
Mg(s) + 2 CH3CO2H(aq) = Mg(CH3CO2)2(aq) + H2 (g)
Since acetic acid is a weak acid it should not be shown dissociated in the total ionic or the net ionic equation. Mg(CH3CO2)2(salt) is a strong electrolytes. The total ionic equation therefore is:
Mg(s) + 2 CH3CO2H(aq) =Mg˄+(aq) + 2CH3CO2 ˄– (aq) + H2 (g)
Following similar arguments, the total ionic equation of the second reaction can also be obtained.
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