Question

20 points!!!

Write the equation for the dissolution of each of the following in water, and then indicate the total number of moles of solute ions formed.

a. 0.50 mole Rb3PO4

b. 0.50 mole Cr2(SO4)3

Answer 1

A)
Each mole of Rb₃PO₄ will release:
3 moles of Rb⁺
1 mole of PO₄⁻³
So a total of 4 moles of ions are released per mole.
If there are 0.5 moles, 2 moles of ions will be released.

B)
Each mole of Cr₂(SO₄)₃ will release:
2 moles of Cr⁺³
3 moles of SO₄⁻²

So a total of 5 moles of ions are released per mole.
When there are 0.5 moles, 2.5 moles of ions will be released.