chem help (1 Viewer)

d3st1nyLiang

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how do acid and metal reactions work

e.g.
hydrochloric acid combines with magnesium
HCl -> H3O(+) + Cl(-)


another equation

HC2H3O2 <-> H3O(+) + C2H302(-)

this one clearly has less hydronium because its a weaker acid

what is the equation for the combination of the acid with magnesium? and does the amount of hydronium determine the amount of h2 gas? if so how does the hydronium form hydrogen gas?

can anyone explain the processes

thanks
 

Pwnage101

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Your first equation is wrong - you have more atoms on the right than left, which violates the alw of conservation of matter. if your talking about the ionisation of HCl in solution it is:

HCl --> H+ + Cl-

OR (The more correct)

HCl + H20 ---> H3O+ + Cl-

what you're after is:

2HCl(aq) + Mg(s) ---> MgCl2(aq) + H2(g)

what determines the amount of H2(g) is both the HCl and the Mg if we are talking about limiting reagents and stuff. If Hcl is in exess (as it usually is) the amount og Mg determines ho much product is formed - its all to do with number of moles of H2 and Mg there are.

plus the hydronium ion does not form from H2(g), i dont understand what you are asking here?
 
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d3st1nyLiang

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so why isnt it hcl in water + magnesium shown in the equation?
 

shady145

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hmm
HCl+water=HCl(aq)
2HCl(aq)+Mg(s)------------>MgCl2(aq) + H2(g)
MgCl2(aq)=MgCl2+water, the water is still there but we write it in aqueous state, (dissolved in water)
and when HCl is not dissolved in water it is not called hydrocholric acid but hydrogen chloride(i think). the aicidic property is made by the hydrogen ion(proton) so for it to be an acid it needs to be dissolved to make the hydrogen ions.
 

d3st1nyLiang

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rite, so yu dont need to include water in aqueous equations

also, how does the hydrogen form?
 

katie tully

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you dont need h20 in (aq) equations, no

and equilibrium equations dont generally need h20 either
 

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