Complete and balance:
FeCl3 (aq) + KSCN(aq) ___________ + ____________?
Cu (s) + HNO3(aq) Cu(NO3)2(aq) + H2O (l) + ____________?
Nevermind, I got it already, its:
FeCl3(aq) + 3 KSCN(aq)--> Fe(SCN)3(aq) + 3 KCl(aq)
3 Cu (s) + 8 HNO3 (aq) --> 3 Cu(NO3)2 (aq) + 2 NO (g) + 4 H2O (l)
To complete and balance the chemical equations, we need to follow a step-by-step approach. Let's begin with the first equation:
FeCl3 (aq) + KSCN(aq) → ___________ + ____________
1. Begin by identifying the chemical formulas of the reactants and products:
- FeCl3: Iron(III) chloride
- KSCN: Potassium thiocyanate
2. Determine the possible products by swapping the cations and anions. For this reaction, Fe cation (Fe3+) will combine with SCN anion (SCN-) and K cation (K+) will combine with Cl anion (Cl-).
So, the possible products are:
- Fe(SCN)3: Iron(III) thiocyanate
- KCl: Potassium chloride
3. Now, we need to check if the reaction is balanced. Count the number of atoms on both sides of the equation:
Reactants: Fe: 1 Fe ion, Cl: 3 Cl ions, K: 1 K ion, SCN: 1 SCN ion
Products: Fe: 1 Fe ion, SCN: 3 SCN ions, K: 1 K ion, Cl: 1 Cl ion
Since both sides have the same number of each type of atom, the equation is already balanced.
Therefore, the balanced equation is:
FeCl3 (aq) + KSCN(aq) → Fe(SCN)3(s) + KCl(aq)
Moving on to the second equation:
Cu (s) + HNO3(aq) → Cu(NO3)2(aq) + H2O (l) + ____________
1. Determine the chemical formulas of the reactants and products:
- Cu: Copper
- HNO3: Nitric acid
2. The products of this reaction are Cu(NO3)2 (copper(II) nitrate) and H2O (water).
3. Check the balance of atoms on both sides:
Reactants: Cu: 1 Cu atom, H: 1 H, N: 1 N, O: 3 O
Products: Cu: 1 Cu atom, N: 2 N, O: 6 O, H: 2 H
To balance the equation, we need to add coefficients:
Cu (s) + 4HNO3(aq) → Cu(NO3)2(aq) + 2H2O (l) + ____________
Now, the equation is balanced.
So, the complete and balanced equation is:
Cu (s) + 4HNO3(aq) → Cu(NO3)2(aq) + 2H2O (l) + NO2(g)
Note: The addition of NO2(g) in the balanced equation accounts for the evolution of nitrogen dioxide gas during the reaction.