which of these salts is least soluble in water?
1. LiCl
2. RbCl
3. FeCl2
4. PbCl2
PbCl2 because I got it right
yr
it's 4. PbCl2
To determine which of these salts is least soluble in water, we can look at the solubility rules. Solubility rules are guidelines that help determine the solubility of different salts in water.
The solubility rules state that most chloride salts are soluble in water, except for a few exceptions. One of the exceptions is when a salt that contains a chloride ion (Cl-) pairs with a cation that forms an insoluble salt.
Let's go through each salt and check for any exceptions:
1. LiCl (lithium chloride): Lithium chloride is a group IA salt, and most group IA chlorides are highly soluble in water. Therefore, LiCl is likely to be soluble.
2. RbCl (rubidium chloride): Like lithium chloride, rubidium chloride is a group IA salt. Group IA chlorides generally have high solubility, so RbCl is likely to be soluble.
3. FeCl2 (iron(II) chloride): Iron(II) chloride contains the cation Fe2+ and chloride ion. From the solubility rules, we know that most chlorides are soluble, but iron(II) chloride is an exception. Iron(II) chloride forms a moderately soluble salt, so it is less soluble compared to LiCl and RbCl.
4. PbCl2 (lead(II) chloride): Lead(II) chloride contains the cation Pb2+ and chloride ion. According to the solubility rules, chlorides of lead(II) are generally insoluble in water. Therefore, PbCl2 is expected to be the least soluble among the given salts.
Based on the solubility rules, the salt least soluble in water among the given options is PbCl2 (lead(II) chloride).
Fujccn
A simplified set of solubility rules. Memorize the rules.
http://www.files.chem.vt.edu/RVGS/ACT/notes/solubility_rules.html