How would you find the net ionic equation of "HCl" + "Zn" | 您所在的位置:网站首页 › hcl zn › How would you find the net ionic equation of "HCl" + "Zn" |
For starters, make sure that you have a balanced equation to work with. To balance the equation given to you, multiply the hydrochloric acid by #2# #"Zn"_ ((s)) + color(blue)(2)"HCl"_ ((aq)) -> "ZnCl"_ (2(aq)) + "H"_ (2(g))# You know that hydrochloric acid is a strong acid, which means that it dissociates completely in aqueous solution to produce hydrogen ions, #"H"^(+)#, and chloride anions #"HCl"_ ((aq)) -> "H"_ ((aq))^(+) + "Cl"_ ((aq))^(-)# Now ,zinc chloride, #"ZnCl"_2#, is soluble in aqueous solution, which means that it too will exist as ions #"ZnCl"_ (2(aq)) -> "Zn"_ ((aq))^(2+) + 2"Cl"_ ((aq))^(-)# This means that you can write #"Zn"_ ((s)) + color(blue)(2) xx ["H"_ ((aq))^(+) + "Cl"_ ((aq))^(-)] -> "Zn"_ ((aq))^(2+) + 2"Cl"_ ((aq))^(-) + "H"_ (2(g))# This is equivalent to #"Zn"_ ((s)) + 2"H"_ ((aq))^(+) + 2"Cl"_ ((aq))^(-) -> "Zn"_ ((aq))^(2+) + 2"Cl"_ ((aq))^(-) + "H"_ (2(g))# Now, the net ionic equation is obtained by removing the spectator ions, i.e. the ions that are present on both sides of the equation. In this case, you have #"Zn"_ ((s)) + 2"H"_ ((aq))^(+) + color(red)(cancel(color(black)(2"Cl"_ ((aq))^(-)))) -> "Zn"_ ((aq))^(2+) + color(red)(cancel(color(black)(2"Cl"_ ((aq))^(-)))) + "H"_ (2(g))# The net ionic equation that describes this single replacement reaction will thus be #color(darkgreen)(ul(color(black)("Zn"_ ((s)) + 2"H"_ ((aq))^(+) -> "Zn"_ ((aq))^(2+) + "H"_ (2(g)))))# |
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