Which of the following ionic compounds is INSOLUBLE in water?

a. CuSO4
b. AgBr
c. KI
d. (NH4)2CO3
e. LiNO3

http://www.files.chem.vt.edu/RVGS/ACT/notes/solubility_rules.html

To determine which of the following ionic compounds is insoluble in water, we need to refer to a solubility table that provides information on the solubility of different compounds.

According to the table, the compound AgBr is insoluble in water.

Therefore, the answer is (b) AgBr.

To determine which of the following ionic compounds is insoluble in water, we can use solubility rules. These rules provide guidelines to predict whether an ionic compound is soluble or insoluble in water based on the combination of ions it contains.

Here are the solubility rules that can help us determine the solubility of each compound:

1. All common sodium (Na+), potassium (K+), and ammonium (NH4+) salts are soluble.
2. All nitrates (NO3-) and acetates (C2H3O2-) are soluble.
3. Most chlorides (Cl-), bromides (Br-), and iodides (I-) are soluble, except for those combined with silver (Ag+), mercury(I) (Hg2+), and lead (Pb2+).
4. Most sulfates (SO42-) are soluble, except for those combined with barium (Ba2+), strontium (Sr2+), calcium (Ca2+), lead (Pb2+), and silver (Ag+).
5. Most carbonates (CO32-), phosphates (PO43-), sulfides (S2-), and hydroxides (OH-) are insoluble, except for group 1 cations (Li+, Na+, K+, etc.) and ammonium (NH4+).

Applying these rules to the compounds in the question:

a. CuSO4 (copper(II) sulfate) - Copper (II) sulfate is soluble in water according to solubility rule #4.
b. AgBr (silver bromide) - Silver bromide is insoluble in water according to solubility rule #3.
c. KI (potassium iodide) - Potassium iodide is soluble in water according to solubility rule #3.
d. (NH4)2CO3 (ammonium carbonate) - Ammonium carbonate is insoluble in water according to solubility rule #5.
e. LiNO3 (lithium nitrate) - Lithium nitrate is soluble in water according to solubility rule #2.

Therefore, the ionic compound that is insoluble in water is option d. (NH4)2CO3 (ammonium carbonate).

Silver Fluoride is somewhat soluble in water, but the other halides are mostly insoluble.