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Help me with this chemistry questions please URGENT

1. When using silver nitrate to test for the presence of chloride ions in aqueous solution,it is important to add another reagent to prevent interference by any carbonate ions which would form a white precipate of Ag2CO3.

Identify this other reagent

Write an equation to show how this other reagent reacts with sodium carbonate.

What have you tried?

nitric acid

is it NaCO3+ 2HNO3 -> Na(NO3)2 + H2O + CO2
This is to get rid of CO2 which is shown by the effervescence?

Reply 4

charco

Study Forum Helper

Original post by coconut64

is it NaCO3+ 2HNO3 -> Na(NO3)2 + H2O + CO2
This is to get rid of CO2 which is shown by the effervescence?

You have the formulae of sodium carbonate and sodium nitrate incorrect, but the idea is good, although the carbon dioxide is irrelevant as you are trying to get rid of the carbonate ions.

Reply 5

Jpw1097

Original post by England113

The reagent would be nitric acid. The equation is:

Na₂CO₃+ 2HNO₃==> 2NaNO₃+ H₂O + CO₂

Removing the spectator ions gives you the following ionic equation:

CO₃^2- + 2H⁺==> H₂O + CO₂

Reply 6

alow

Original post by Jpw1097

Doing someone's work for them isn't very helpful.

Reply 7

coconut64

Original post by charco

You have the formulae of sodium carbonate and sodium nitrate incorrect, but the idea is good, although the carbon dioxide is irrelevant as you are trying to get rid of the carbonate ions.

Thanks! That's a terrible mistake.

Reply 8

JackLeggett

Sorry as this is your post but I need help also. Here is my thread.

http://www.thestudentroom.co.uk/showthread.php?t=4285948

Posted from TSR Mobile

Reply 9

Jpw1097

Original post by alow

Doing someone's work for them isn't very helpful.

That's for the OP to decide.

Reply 10

alow

Original post by Jpw1097

That's for the OP to decide.

http://www.thestudentroom.co.uk/showthread.php?t=4066671&p=64637319#post64637319

Read this before you post any more answers.

There's no point in giving someone an answer, it's much more helpful to everyone if you give the OP nudges in the right direction as then they can figure out things for themselves.

The aim is to help the OP understand the question, not to show off how smart you are.

Reply 11

England113

Original post by Jpw1097

Thanks it means a lot

Reply 12

England113

Original post by Jpw1097

The presence of some halide ions in solution can be detected using aqueous silver nitrate and aqueous ammonia.Identify a halide ions which, on addition of aqueous silver nitrate , forms a precipitate that is insoluble in concentrated aqueous ammonia.Identify a halide ion which cannot be detected using these reagents.

Reply 13

url0velyhannah

Posted from TSR Mobile

The reagent is Nitric Acid HNO3

Reply 14

England113

Original post by url0velyhannah

Posted from TSR Mobile

The reagent is Nitric Acid HNO3

The presence of some halide ions in solution can be detected using aqueous silver nitrate and aqueous ammonia.

Identify a halide ions which, on addition of aqueous silver nitrate , forms a precipitate that is insoluble in concentrated aqueous ammonia.

Identify a halide ion which cannot be detected using these reagents.

Reply 15

Razamataz666

looking at this Chemistry lark makes me wonder how i got an A at GCSE, thank God i ain't doing it at A-level.

Reply 16

Jpw1097

Original post by England113

The presence of some halide ions in solution can be detected using aqueous silver nitrate and aqueous ammonia.

Identify a halide ions which, on addition of aqueous silver nitrate , forms a precipitate that is insoluble in concentrated aqueous ammonia.

Identify a halide ion which cannot be detected using these reagents.

http://www.chemguide.co.uk/inorganic/group7/testing.html

This page should have all the information you need. Feel free to ask if you need any more help.