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1)Write the BALANCED equation for the reaction

with CORRECT state symbols:

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

2)Now rewrite the equation replacing aqueous substances

as they would appear in solution( ie)as ions.Leave

everything else as is in the standard state.

Mg(s) + 2H+ (aq) + 2Cl-(aq)---->Mg2+(aq) +2Cl-(aq) +H2(g)

3)Now cancel ions common to both sides ,that is,spectator

ions.

Cancel the 2Cl-(aq) on each side.

4)Rewrite the equation without what you have canceled.

Mg(s) + 2H+(aq)------>Mg2+(aq) + H2(g).

Good Luck.

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12y ago

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