What Are the Products of These Double Replacement Reactions?

[GDawg36]

^^Double Replacement Reactions^^
NaOH+CuSO4 -> ?
NH4I+AgNO3 -> ?
K2CO3+ Ba(OH)2 -> ?
KOH+ HI -> ?
K2CO3 + HNO3 -> ?
(NH4)2SO4+BaCl2 -> ?
Na2S+ NiSO4 -> ?
Pb(NO3)2+KBr -> ?
Fe2(SO4)3 +Ba(OH)2 -> ?
Hg2(NO3)2+KI -> ?
Don't really get this...Please Help!

 

[Cesium]

Well I'm definitely not going to do this all for you, and your text should explain this anyways. This type of stuff should be posted in the homework section...

Generally speaking for double replacement reactions:
1) Break each species into ions.
2) Switch the ions around so that new species form.
3) Reaction will occur if there is a) formation of a precipitate b) formation of a gas c) neutralization. Otherwise the reaciton will not occur.
4) Balance equation.

Your first one:
NaOH + CuSO4

NaOH --> Na+ + OH-
CuSO4 --> Cu+2 + SO4-2

Switch them up so you have Na+ and SO4-2. Therefore you need 2 Na+ for one SO4-2: Na2SO4.

And you're left with Cu+2 and OH_. You need 2 OH- for one Cu+2: Cu(OH)2

This reaction occurs because Cu(OH)2 forms a precipitate (is mostly insoluble in water).

Now balance your equation:

2NaOH (aq) + CuSO4 (aq) --> Na2SO4 (aq) + Cu(OH)2 (s)

When factoring binomials in algebra, you use FOIL method (first outside inside last). My chemistry teacher called this the "OI" method for outside inside. This might help you remember it.

Things get more complicated with polyprotic acids and hydrolysis of transition metals.

Also remember that carbonic acid is unstable so:
H2CO3 --> H2O + CO2

Other than that all of those are rather straightforward.

 

[Blueshift5]

Double replacement reactions, also known as double displacement reactions, occur when two compounds exchange ions to form two new compounds. In these reactions, the positive ions in one compound switch places with the positive ions in the other compound, resulting in the formation of two new compounds. The general formula for a double replacement reaction is AB + CD -> AD + CB.

Now, let's look at the specific reactions given in the question:

1. NaOH + CuSO4 -> Na2SO4 + Cu(OH)2
In this reaction, the sodium ions (Na+) in sodium hydroxide (NaOH) switch places with the copper ions (Cu2+) in copper sulfate (CuSO4), resulting in the formation of sodium sulfate (Na2SO4) and copper hydroxide (Cu(OH)2).

2. NH4I + AgNO3 -> NH4NO3 + AgI
Here, the ammonium ions (NH4+) in ammonium iodide (NH4I) exchange with the silver ions (Ag+) in silver nitrate (AgNO3), producing ammonium nitrate (NH4NO3) and silver iodide (AgI).

3. K2CO3 + Ba(OH)2 -> 2KOH + BaCO3
In this reaction, the potassium ions (K+) in potassium carbonate (K2CO3) switch places with the barium ions (Ba2+) in barium hydroxide (Ba(OH)2), resulting in the formation of potassium hydroxide (KOH) and barium carbonate (BaCO3).

4. KOH + HI -> KI + H2O
Here, the potassium ions (K+) in potassium hydroxide (KOH) exchange with the hydrogen ions (H+) in hydroiodic acid (HI), producing potassium iodide (KI) and water (H2O).

5. K2CO3 + HNO3 -> KNO3 + H2O + CO2
In this reaction, the potassium ions (K+) in potassium carbonate (K2CO3) switch places with the nitrate ions (NO3-) in nitric acid (HNO3), resulting in the formation of potassium nitrate (KNO3), water (H2O), and carbon dioxide (CO2).

6. (NH4)2SO4 + BaCl2 -> 2NH4Cl + BaSO4