Sodium phosphate is added to a solution that contains 0.0046 M aluminum nitrate

Question

Sodium phosphate is added to a solution that contains 0.0046 M aluminum nitrate and 0.055 M calcium chloride. The concentration of the first ion to precipitate (either Al3+ or Ca2+) decreases as its precipitate forms. What is the concentration of this ion when the second ion begins to precipitate?

Question 23 sodium phosphate is added to a solution that contains 0.0046 M aluminum nitrate and 0.055 M calcium chloride. The concentration of the first ion to precipitate (either A 3+ or Caet) decreases as its precipitate forms. What is the concentration of Not answered Marked out of 1.00 this ion when the second ion begins to precipitate? Flag question Answer:

Explanation / Answer

2Na3PO4 + 3CaCl2 6NaCl + Ca3(PO4)2

Na3PO4 + Al(NO3)3= AlPO4 + 3 NaNO3

These are the reactions

Calcium is more reactive than Aluminum

So it will react first and form precipitate

The answer is ...

Aluminum will not form precipitate until all Calcium have reacted

because as long as Calcium is present .. it has the upper hand

so The answer is ... the concentration of Ca2+ will be zero when Al3+ starts to precipitate.

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