When solid Pb metal is put into an aqueous solution of Cu(NO_3)_2 solid Cu metal

Question

When solid Pb metal is put into an aqueous solution of Cu(NO_3)_2 solid Cu metal and a solution of Pb(NO_3)_2 result. Write the net ionic equation for the reaction (Use the lowest possible coefficients. Use the pull-down boxes to specify states such as (aq)or (s). If a box is not needed, leave it blank.) When aqueous solutions of potassium nitrite and hydroiodic acid are mixed, an aqueous solution of potassium iodide and nitrous acid results. Write the net ionic equation for the reaction (Use the lowest possible coefficients. Use the pull-down boxes to specify states such as (aq) or (s) If a box is not needed, leave it blank. Use H^+ for the hydronium ion.) When aqueous solutions of cobalt(II) chloride and ammonium phosphate are combined, solid cob phosphate and a solution of ammonium chloride are formed. The net ionic equation for this reaction is (Use the lowest possible coefficients. Use the pull-down boxes to specify states such as (aq) or (s). If a box is not needed, leave it blank.) Write the net ionic equation for any precipitation reaction that may be predicted by the solubility rules on the information page, when aqueous solutions of nickel(II) iodide and potassium hydroxide are combined. (Use the lowest possible coefficients for the reaction. Use the pull-down boxes to specify states such as (aq) or (s) If a box is not needed, leave it blank. If no reaction occurs, leave all boxes blank and click on Submit)

Explanation / Answer

1) Pb(s)   + Cu(NO3)2(aq)   ------------> Cu(s)   + Pb(NO3)2(aq)   total equation

Pb(s)   + Cu+2(aq)   ----------------> Cu(s)    + Pb+2(aq)   net ionic equation

2) KNO2(aq)   + HI(aq) ---------------> KI(aq) + HNO2(aq)

H+(aq)   + HNO2-(aq)   ----------> HNO2(aq)

3) 3CoCl2(aq)   + 2(NH4)3PO4(aq)   -----------> Co3(PO4)2(s)   + 6 NH4Cl(aq) complete equation

3Co+2(aq)   + 2PO4-2(aq)   -----------> Co3(PO4)2(s)    net ionic equation

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