When aqueous solutions of potassium nitrite and nitric acid are mixed, an aqueous solution of potassium nitrate and nitrous acid results. Write the net ionic equation for the reaction.

1.) C2H3O2-(aq) + H+(aq) ===> HC2H3O2(aq). K+ and Cl- are spectator ions. 2.) Ni(s) + Sn2+(aq) ===> Ni2+(aq) + Sr(s). NO3- is a spectator ion. 3.) 3Ag+ + PO4(3-)(aq) ===> Ag3(PO4)(s). Na+ and NO3-

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All the elements are arranged by melting points on the periodic table. in row they go from metals to gasses. in the row from sodium to argon, sodium is more reactive than the one on its right, magnesium.