5. DOUBLE REPLACEMENT
REACTIONS
Conditions when Double
Replacement Reactions occur
• The ions of 2 compounds exchange
places in an AQUEOUS solution to form 2
new compounds.
• Examples:
• AB + CD → AD + CB
• Pb(NO3)2(aq) +KI(aq) → KNO3(aq) + PbI2(s)
• Double replacement reactions do not
always occur.
• We use the term No Reaction (NR) when
no significant change occurs in a reaction.
• 1. If the product is insoluble. (A precipitate
is formed) ↓
Solubility Chart (Table F)
– Insoluble: cannot be dissolved in water
– Precipitate: an insoluble product
Determine whether the compound is soluble or insoluble
a. NH4OH
b. PbCl2
c. BaCO3
d. Al(OH)3
e. Na2S
f. K2SO4
g. CaSO4
h. Mg3(PO4)2
i. Zn(OH)2
Now complete each of the following double replacement equations. For each of the products use Table F to assign a notation of (s) or (aq) below each formula.
1. BaCl2 (aq) + Na2CO3 (aq) →
3. CaI2 (aq) + Na3PO4 (aq) →
2. Zn(NO3)2 (aq) + KOH (aq) →
4. CuSO4 (aq) + (NH4)2CO3 (aq) →
1