Test tube reaction question

tmifan

7

i don't really get what I could as a reagent...
Thanks

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Reply 1

yusyus

21

look at halide and sulphate test

Original post by tmifan

i don't really get what I could as a reagent...
Thanks

You are looking for an ionic compound that produced a precipitate with one and not the other, or maybe evolution of gas with one and not the other.

Think about the ions present in each compound under analysis...

Reply 3

tmifan

OP

7

Original post by charco

You are looking for an ionic compound that produced a precipitate with one and not the other, or maybe evolution of gas with one and not the other.

Think about the ions present in each compound under analysis...

Would AgCl for the first question be correct?
White precipitate
No visible change

and

Ca2SO4 for the second be right?
White precipitate
No visible change

Original post by tmifan

Would AgCl for the first question be correct?
White precipitate
No visible change

and

Ca2SO4 for the second be right?
White precipitate
No visible change

No, the reagent itself must be soluble.

Reply 5

tmifan

OP

7

Original post by charco

No, the reagent itself must be soluble.

How would I make it soluble...?

Original post by tmifan

How would I make it soluble...?

you can't make it soluble, it has to BE soluble.

Reply 7

tmifan

OP

7

Original post by charco

you can't make it soluble, it has to BE soluble.

Nope. Don't get what I could use. :colondollar:

Original post by tmifan

Nope. Don't get what I could use. :colondollar:

To test for chloride ions you add a soluble silver salt ...

Reply 9

Droneon

13

Original post by tmifan

Nope. Don't get what I could use. :colondollar:

You could use Potassium Iodide for the first one and sulfuric acid for the second one. They're both soluble.

Posted from TSR Mobile

Reply 10

tmifan

OP

7

Original post by charco

To test for chloride ions you add a soluble silver salt ...

Siver nitrate? But thats in the question...

Original post by tmifan

Siver nitrate? But thats in the question...

so reverse the question ...

Reply 12

tangled23

12

first one you could add nacl Therefore Agcl would form and this white ppt is insoluble
For second add sulfuric acid as bariumsulfate forms an insoluble white ppt and mgsulfate dissolves,

(edited 6 years ago)

Reply 13

tmifan

OP

7

Original post by charco

so reverse the question ...

i give up. i know that silver nitrate+nitric acid and chloride ions would produce a white ppt of AgCl.... that is it.

Reply 14

TheTennisOne

6

Original post by tmifan

i give up. i know that silver nitrate+nitric acid and chloride ions would produce a white ppt of AgCl.... that is it.

Could you not just use NaCl for the first one and get a white precipitate of AgCl with AgNO3 and then No Change with NaNO3
Then standard sulfate test H2SO4 + BaCl2 will give a white precipitate and no change with MgCl2

Reply 15

tmifan

OP

7

Original post by TheTennisOne

Could you not just use NaCl for the first one and get a white precipitate of AgCl with AgNO3 and then No Change with NaNO3
Then standard sulfate test H2SO4 + BaCl2 will give a white precipitate and no change with MgCl2

Original post by tangled23

first one you could add nacl Therefore Agcl would form and this white ppt is insoluble
For second add sulfuric acid as bariumsulfate forms an insoluble white ppt and mgsulfate dissolves,

Ah thanks - they are both soluble. got it. lol.
how did you guys just know that...

Test tube reaction question

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