Which if the following compounds is insoluble in water
(NH4)2CO3
AgBr
CuSO4
KI
LiNO3
I thought it might be AgBr
Look at your solubility table (rules). Don't have one? Here is one on-line.
http://www.chem.vt.edu/RVGS/ACT/notes/solubility_rules.html
To determine whether a compound is soluble or insoluble in water, you can use solubility rules. Solubility rules provide guidelines for predicting whether a compound will dissolve in water or form a precipitate (insoluble substance).
In the case of the given compounds, let's go through each one:
1. (NH4)2CO3 (Ammonium carbonate):
According to the solubility rules, compounds containing the ammonium ion (NH4+) are generally soluble, so (NH4)2CO3 is expected to be soluble in water.
2. AgBr (Silver bromide):
According to the solubility rules, most silver compounds are insoluble in water, including silver bromide. So, AgBr is expected to be insoluble in water, and you are correct.
3. CuSO4 (Copper(II) sulfate):
Copper(II) sulfate is soluble in water, so CuSO4 is expected to be soluble.
4. KI (Potassium iodide):
Compounds containing the iodide ion (I-) are generally soluble, so KI is expected to be soluble in water.
5. LiNO3 (Lithium nitrate):
Compounds containing lithium ion (Li+) are generally soluble, and nitrate compounds are also soluble. Therefore, LiNO3 is expected to be soluble.
In conclusion, the compound that is insoluble in water among the given options is AgBr (Silver bromide).