Asked by Alex
A student dissolves 22.4 g of sodium phosphate to prepare a 2.98 L solution. Another student then dilutes this solution to 4.90 L. If sodium phosphate completely dissociates, determine the number of mols of each ion in the final solution.
Answers
Answered by
DrBob222
The 2.98 L is a false alarm and just extra data. Ignore it. So is the 4.90L. Ignore it too.
You have how many mols Na3PO4. That's mols = grams/molar mass = ?
So mols Na^+ = 3x mols Na3PO4.
and mols PO4^3- = mols Na3PO4.
I know students don't like to ignore data (it's there so I must need it) but trust me, both of these volumes are red herrings. mols = mols = mols, no matter how much water you add to them. If the question asks for molarity (M), that's a different matter.
You have how many mols Na3PO4. That's mols = grams/molar mass = ?
So mols Na^+ = 3x mols Na3PO4.
and mols PO4^3- = mols Na3PO4.
I know students don't like to ignore data (it's there so I must need it) but trust me, both of these volumes are red herrings. mols = mols = mols, no matter how much water you add to them. If the question asks for molarity (M), that's a different matter.
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