Help!! What is the colour of Barium Phosphate?

[davemate03]

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Hey guys, I realised that the precipitation tests that I learnt are really wierd compared to everyone elses e.g. Test for Phosphate ions, add ammonium molybdate?

I looked up my textbook and it says to add OH to make it alkaline and then BaPO4. However, it doesn't say anything about the colour??

Can anyone help?

[Fortify]

For phosphate, add silver nitrate solution and it'll form a yellow precipitate (silver phosphate).

[davemate03]

Oh cheers mate, what about Lead? I'm fairly sure it goes yellow with something as well....

[Divinity_]

Add HCl or salt that contains Chloride, it forms white ppte of lead chloride.

[tizona]

Originally Posted by davemate03

Oh cheers mate, what about Lead? I'm fairly sure it goes yellow with something as well....

add iodide and it will form a yellow precipitate of lead iodine

[Xcelz]

Originally Posted by tizona

add iodide and it will form a yellow precipitate of lead iodine

this is right. you can add iodide in the form of potassium iodide usually.

[Fortify]

Originally Posted by Divinity_

Add HCl or salt that contains Chloride, it forms white ppte of lead chloride.

I think this one is right, I checked both Jacaranda and Conquering Chem says this/

[tizona]

according to the solubility table, chlorines, bromides and iodides are soluble except for lead, mercury and silver.

so adding chloride or iodide wont make a difference, but iodide is preferable because it forms a yellow precipitate instead of the normal white precipitate and thus would be easily distinguished from other cations.

[Fortify]

Originally Posted by tizona

according to the solubility table, chlorines, bromides and iodides are soluble except for lead, mercury and silver.

so adding chloride or iodide wont make a difference, but iodide is preferable because it forms a yellow precipitate instead of the normal white precipitate and thus would be easily distinguished from other cations.

But then Pb2+ is the 1st ppte out according to this:

[lychnobity]

Originally Posted by davemate03

Hey guys, I realised that the precipitation tests that I learnt are really wierd compared to everyone elses e.g. Test for Phosphate ions, add ammonium molybdate?

I looked up my textbook and it says to add OH to make it alkaline and then BaPO4. However, it doesn't say anything about the colour??

Can anyone help?

The ammonium molybdate method is one based on colour.

Ok, to test for phosphates using this method, add acid to the sample, then add ammonium molybdate. If phosphate is present, it'll turn yellow.

[harry4]

i learnt to test for phosphate you make the solution alkaline by adding NH3 and then add Ba2+ and you get a white ppt

[mR sinister]

Quick and easy method:
Add HNO3
and yellow ppt forms.

goodluck tommorow

[arjungamer123]

Originally Posted by mR sinister

Quick and easy method:
Add HNO3
and yellow ppt forms.

goodluck tommorow

Nice trolling you got there.

All nitrates are soluble.

[ajay098]

Originally Posted by lychnobity

The ammonium molybdate method is one based on colour.

Ok, to test for phosphates using this method, add acid to the sample, then add ammonium molybdate. If phosphate is present, it'll turn yellow.

if u are gonna add H+/molybdate, u MUST heat it