Complete and balance each of the following molecular reactions. Indicate the phase of each species. If no reaction occurs, write N.R.
A) ____ Na2CO3 (aq) + ___ Mg (NO3)2 (aq) -->
B)____ K2SO4(aq) + ___ Fe(CH3CO2)2 (aq) -->
C)___ AlCl3 (aq) +____ K2S (aq)
Please help and explain!!
To complete and balance the given molecular reactions, we need to use the solubility rules to determine the states of each species. The solubility rules state that most nitrate (NO3-) and acetate (CH3CO2-) compounds are soluble, as well as alkali metal (Group 1) compounds, while most carbonate (CO32-) and sulfide (S2-) compounds are insoluble, as well as most chloride (Cl-) compounds except when paired with alkali metals.
A) Na2CO3 (aq) + Mg(NO3)2 (aq):
In this reaction, we have sodium carbonate (Na2CO3) and magnesium nitrate (Mg(NO3)2). Based on the solubility rules, sodium (Na+) and nitrate (NO3-) compounds are soluble, while carbonate (CO32-) compounds are usually insoluble. Therefore, we can leave Na2CO3 as aqueous (aq) and Mg(NO3)2 as aqueous (aq).
Balancing the equation:
Na2CO3 (aq) + Mg(NO3)2 (aq) --> NaNO3 (aq) + MgCO3 (s)
B) K2SO4 (aq) + Fe(CH3CO2)2 (aq):
In this reaction, we have potassium sulfate (K2SO4) and iron(II) acetate (Fe(CH3CO2)2). Both potassium (K+) and sulfate (SO42-) compounds are soluble, as well as most acetate (CH3CO2-) compounds. Therefore, we can leave K2SO4 and Fe(CH3CO2)2 both as aqueous (aq).
Balancing the equation:
K2SO4 (aq) + Fe(CH3CO2)2 (aq) --> K(CH3CO2)2 (aq) + FeSO4 (aq)
C) AlCl3 (aq) + K2S (aq):
In this reaction, we have aluminum chloride (AlCl3) and potassium sulfide (K2S). Aluminum (Al3+) and chloride (Cl-) compounds are usually soluble, while sulfide (S2-) compounds are often insoluble. Therefore, we can leave AlCl3 as aqueous (aq) and K2S as aqueous (aq).
Balancing the equation:
AlCl3 (aq) + 3 K2S (aq) --> Al2S3 (s) + 6 KCl (aq)
So the balanced molecular equations are:
A) Na2CO3 (aq) + Mg(NO3)2 (aq) --> NaNO3 (aq) + MgCO3 (s)
B) K2SO4 (aq) + Fe(CH3CO2)2 (aq) --> K(CH3CO2)2 (aq) + FeSO4 (aq)
C) AlCl3 (aq) + 3 K2S (aq) --> Al2S3 (s) + 6 KCl (aq)