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If you wish to test for the presence of halogen in an iodoform, then you must first inject the iodoform with a touch of helium. This helium will make the halogen react and change colors, making it notable in the iodoform.
Wiki User
∙ 10y ago
Wiki User
∙ 12y agoFirst: Flame Test or Beilstein Test- Purple Flame
Second: Silver Nitrate Test- formation of silver iodide (AgI), yellow precipitate
note: AgI- light sensitive powder used in photographic emulsions and antiseptic. Scattered in clouds to cause rainfall.
Wiki User
∙ 11y ago1) Add silver nitrate to the solution that you want to test for halide ions under acidic conditions (apply nitric acid)
2) A precipitate will form
- A white precipitate indicates the presence of chloride ions
- A cream precipitate indicates the presence of bromide ions
- A yellow precipitate indicates the presence of iodide ions
Also, if you add acidified lead (II) nitrate to the unknown solution, a deep yellow precipitate of lead (II) iodide indicates that iodide ions are present.
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Why add dilute nitric acid with silver nitrate to test for halide ions?
The nitric acid reacts with other ions that might precipitate with silver nitrate. Doing this first gets these other unwanted precipitates out of the way. If you are testing with Fluoride as your halide remember that silver nitrate does not precipitate with Fluoride, so no precipitate does not mean that halide ions are not present.
Why should you not expect the halides ions to dissolve in mineral oil?
halide ions strongly interact with the counter-ions. However, mineral oil is non-polar. To dissolve the halide ions (and the counter-ions) into mineral oil would drastically raise system energy. Thus it does not work. More simply, halide ions have a charge and won't easily dissolve in non-polar substances, since like-dissolves-like.
What are halogen ions called?
Ions of the halogen group are called halide ions; their compounds are called halides.
What does silver nitrate detect?
The presence of halide ions
What kind of ion is formed by a halogen?
A halide ion is a hydrogen atom with a negative charge.
Why add dilute nitric acid with silver nitrate to test for halide ions?
The nitric acid reacts with other ions that might precipitate with silver nitrate. Doing this first gets these other unwanted precipitates out of the way. If you are testing with Fluoride as your halide remember that silver nitrate does not precipitate with Fluoride, so no precipitate does not mean that halide ions are not present.
Why should you not expect the halides ions to dissolve in mineral oil?
halide ions strongly interact with the counter-ions. However, mineral oil is non-polar. To dissolve the halide ions (and the counter-ions) into mineral oil would drastically raise system energy. Thus it does not work. More simply, halide ions have a charge and won't easily dissolve in non-polar substances, since like-dissolves-like.
What are halogen ions called?
Ions of the halogen group are called halide ions; their compounds are called halides.
What does silver nitrate detect?
The presence of halide ions
What is the formula of sodium halide?
They are generally represented as NaX. X shows the halide ion. The ions in this family are fluoride, chloride, bromide and iodide.
What are all the possible oxidation states for the halide ions?
-1 oxidation state
What charge do the halogens form?
When halogens form ions, they are called halide ions. These types of ions have a negative charge due to gaining electrons.
How to test for chemicals in a molecular compound?
There are many of methods to test for "chemicals" in a molecular compound, you need to get more specific. i.e what "chemicals" we are looking for. For example if we have halide ions, to identify which halide ion is present add silver nitrate followed by ammonia solution. But theres always mass spectroscopy :p. There are may ways to test for "chemical". You need to be more specific. But theres spectroscopy. :p
What is a halide leak detector test?
detect nytrogen
What kind of ion is formed by a halogen?
A halide ion is a hydrogen atom with a negative charge.
Why do you think no reaction occurs between acidified hydrogen peroxide and halide ions other than iodide?
No reaction occurs between the acidified hydrogen peroxide and the other halide ions, because the hydrogen ions involved in both cases are in the same group. For a reaction to occur it needed to have an element that is more reactive than hydrogen.
How do the Halide ions react with dilute Nitric acid. I have a chemistry test tomorrow and I need to know how the halide ions react with Nitric acid after Silver Nitrate and ammonia have been added?
The Niritric acid is used to remove any ion without will contaminate the reaction. for example if there is any carbonate (CO3) then the nitric acid will react with it: 2 HNO3 (aq) & (CO3)-2 (aq) --> CO2 (g) & H2O (l) & 2 (NO3)- (aq)
