A solution of potassium sulfate, K_2SO_4 is mixed with a solution of lead nitrat

Question

A solution of potassium sulfate, K_2SO_4 is mixed with a solution of lead nitrate, Pb(NO_3)_2 to form a precipitate. Answer the following questions (be sure to show states of matter). a. What is the balanced molecular equation for the reaction? b. What is the balanced complete ionic equation for the reaction? c. What is the net ionic equation? d. Which ions are spectator ions?

Explanation / Answer

(aq) means aqueous solution (s) means solid (sometimes called a precipitate) (g) is gas phase (l) is liquid phase molecular equation (balanced) Pb(NO3)2(aq) + K2SO4(aq) ---------> PbSO4(s) + 2KNO3(aq) compounds with (aq) beside them are dissociated into their constituent ions in water. Write out the TOTAL IONIC equation by showing each (aq) compound as its ions Pb^2+(aq) + 2NO3^-(aq) + 2K^+(aq) + SO4^2-(aq) ------> PbSO4(s) + 2K+(aq) + 2NO3^-(aq) You can see that there are 2K+(aq) and 2NO3^-(aq) on each side of the arrow. These two species have not changed at all the reaction (they are the same charge and in the same state on both sides of the arrow). They are called spectator ions, because they do not participate in the reaction. The spectator ions cancel out, and you write the NET IONIC equation without the spectator ions Pb^2+(aq) + SO4^2-(aq) -----------> PbSO4(s)

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