why is barium phosphate insoluble in water?

Answer 1

Probably because it won't ionize.

Answer 2

It's not insoluble. All salts are soluble in water, but at different saturation points. Barium phosphate has a very low saturation point meaning that it only takes a little bit to maximize the capacity of water to break up the ionic bond holding the barium ion and the phosphate ion together.

By comparison, sodium chloride has a high saturation point meaning that it takes a lot of it to saturate the water solution. However, should you continue to add and add sodium chloride to the solution eventually it will stop dissovling.

Once a solution is saturated nothing else can be dissolved in it; you can add a different salt and you'll see one of two things: 1) the salt you're adding not being able to dissolve or 2) the other salt precipitating out (or "salting out") of the solution because second salt creates a more stable solution.

There are different reasons why certain salts dissolve better than others, in this case I think it's because the phosphate ion (PO4) is huge. Water simply cannot hold too much of it.

**Edit: I just realized that we use sodium phosphate in the lab all the time. It's not the size of the phosphate ion, it's the size of the barium ion. I just looked at the periodic table, it's way down there, so it must be huge compared to other ions like K, Li, or Na.

Answer 3

Barium Phosphate Solubility

Answer 4

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Some of the barium salts insoluble in water are Barium sulfate Barium phosphate, Barium carbonate Barium sulfide

Answer 5

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RE:
why is barium phosphate insoluble in water?

Answer 6

I must admit that I don't specifically know anything about barium phosphate. However, the general rule of solubility is "like dissolves like." This refers to polar versus nonpolar compounds. Water is a polar compound, so it dissolves ionic compounds like sodium chloride, but it doesn't dissolve nonpolar covalent compounds. I'm guessing barium phosphate is a nonpolar covalent compound.

Answer 7

It depends on the nonmetal ion. Carbonate(CO3[-]), Chromate(CrO4[2-]), Oxalate(C2O4[2-]), Phosphate(PO4[3-]), Sulfate(SO4[2-]), and Sulfite(SO3[2-]) all have insoluble combinations with Barium. Those are the ones I know of, anyway.

Answer 8

When one substance dissolves in another, the attractive forces in both must be overcome. The dissolving solute must be able to break up the aggregation of molecules in the solvent (that is, the hydrogen bonds between molecules or the dispersion forces between molecules in a nonpolar solvent), and the molecules of the solvent must have sufficient attraction for the solute particles to remove them one by one from their neighbors in the undissolved solute. If the solute is ionic, only a very polar solvent like water provides enough interaction to effect dissolution . In those ionic compounds like barium sulfate that are called insoluble, the interaction between the ions is greater than can be overcome by interaction with the polar water molecules. If the solute particles are polar molecules, polar solvents such as alcohols can usually effect dissolution. If the solute is nonpolar, it may dissolve only in nonpolar solvents, not because polar solvent molecules are unable to overcome the weak dispersion forces between the solute molecules, but because these dispersion forces are too weak to overcome the dipole-dipole interaction between the solvent molecules.

Answer 9

Yes, most barium salts are insoluble

Answer 10

God made it that way,

Hallelujah.