If 10.3 gm lithium sulfate react with an abundant amount of potassium phosphate, what mass of lithium phosphate can you expect to isolate? 

Expert Answers
gsenviro eNotes educator| Certified Educator

The reaction between lithium sulfate and potassium phosphate is a a double displacement reaction. This reaction can be written as:

`3 Li_2SO_4 + 2 K_3PO_4 -> 2 Li_3PO_4 +3 K_2SO_4`

In this well-balanced chemical reaction, we can see that lithium replace potassium and vice-versa and hence this is a double displacement reaction. 

Molar masses of lithium sulfate = 2 x 7 + 32 + 4 x 16 = 110 g/mol

Molar mass of lithium phosphate = 3 x 7 + 31 + 4 x 16 = 116 g/mol

Using stoichiometry:

3 moles of lithium sulfate produces 2 moles of lithium phosphate, 

or, 3 x 110 g lithium sulfate produces 2 x 116 g lithium phosphate

or, 10.3 g lithium sulfate produces (2 x 116) x 10.3 / (3 x 110) 

 = 7.24 g.

Thus, 10.3 g of lithium sulfate will produce 7.24 g lithium phosphate.

Hope this helps. 

 

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