Use the solubility rules to predict whether the following substances are soluble or insoluble in water:
a) K2CrO4 _______________
b) NiSO4 _______________
c) Cu(OH)2 ______________
d) Pb(C2H3O2)2 __________
e) Ag2CO3 _______________
f) Al2S3 ________________
Please help me with them! Thank You!!
What's to help. Use the solubility rules. I can help with that if you don't understand them. Here is a simplified set of rules.http://www.files.chem.vt.edu/RVGS/ACT/notes/solubility_rules.html
To predict whether a substance is soluble or insoluble in water, you can use solubility rules. Here are the solubility rules that can help us determine the solubility of the given substances:
1. All salts of alkali metals (group 1A elements) are soluble.
2. All nitrates, acetates, and most perchlorates are soluble.
3. Most chlorides, bromides, and iodides are soluble, except for those of silver, lead, and mercury(I).
4. Most sulfates are soluble, except for those of barium, strontium, lead, and calcium.
5. Most hydroxides are insoluble, except for those of alkali metals, ammonium, and barium.
6. Most sulfides are insoluble, except for those of alkali metals, ammonium, and alkaline earth metals.
Now let's apply these rules to determine the solubility of the given substances:
a) K2CrO4: K2CrO4 is a salt of an alkali metal (potassium) and a chromate ion. According to rule 1, all salts of alkali metals are soluble. Therefore, K2CrO4 is soluble in water.
b) NiSO4: NiSO4 is a salt of nickel and sulfate ions. According to rule 2, most sulfates are soluble. Therefore, NiSO4 is soluble in water.
c) Cu(OH)2: Cu(OH)2 is a hydroxide of copper. According to rule 5, most hydroxides are insoluble, except for those of alkali metals, ammonium, and barium. Therefore, Cu(OH)2 is insoluble in water.
d) Pb(C2H3O2)2: Pb(C2H3O2)2 is a salt of lead and acetate ions. According to rule 3, most acetates are soluble. Therefore, Pb(C2H3O2)2 is soluble in water.
e) Ag2CO3: Ag2CO3 is a salt of silver and carbonate ions. According to rule 3, most carbonates are insoluble, except for those of alkali metals and ammonium. Therefore, Ag2CO3 is insoluble in water.
f) Al2S3: Al2S3 is a sulfide of aluminum. According to rule 6, most sulfides are insoluble, except for those of alkali metals, ammonium, and alkaline earth metals. Therefore, Al2S3 is insoluble in water.
So, to summarize the solubility predictions:
a) K2CrO4 is soluble in water.
b) NiSO4 is soluble in water.
c) Cu(OH)2 is insoluble in water.
d) Pb(C2H3O2)2 is soluble in water.
e) Ag2CO3 is insoluble in water.
f) Al2S3 is insoluble in water.