How does sodium iodide test for lead?

When a clear colorless solution of lead nitrate (Pb(NO3)2) is added to a clear colorless solution of sodium iodide (NaI), a yellow precipitate of lead iodide (PbI2) appears.

What is the purpose of sodium iodide?

Sodium iodide is used to prevent or treat iodine deficiency. The body needs iodine for normal growth and health. For patients who are unable to get enough iodine in their regular diet or who have a need for more iodine, sodium iodide may be necessary. Iodine is needed so that your thyroid gland can function properly.

What happens when lead reacts iodine?

This mixing leads to a double displacement reaction, essentially resulting in the metals ‘swapping’ their places in the two compounds, producing lead (II) iodide, and potassium nitrate. When the solutions are added together, they immediately produce a bright yellow precipitate of lead iodide.

What will happen if we combine the solution of sodium iodide and the solution of lead II nitrate the solutions will mix so all of the ions will be?

When these two solutions are mixed, the lead(II) cations, Pb2+ , and the iodide anions, I− , will bind to each other and form lead(II) iodide, an insoluble ionic compound. The other product of the reaction is aqueous sodium nitrate, NaNO3 , which will exist as ions in solution.

Does lead react with sodium nitrate?

There is none, because the anions are identical (and all nitrates are significantly soluble).

How would you separate lead iodide from lead iodide and sodium nitrate?

The reaction between lead nitrate and sodium iodide is really the reaction of lead ions with iodide ions as these are precipitated out of solution. Figure 6: How lead iodide is formed….C5 How much (quantitative analysis)

solid	(s)
aqueous (dissolved in water)	(aq)

Why can Sodium iodide be used as a catalyst?

The secret ingredient is actually sodium iodide, which acts as a catalyst (something that speeds up a chemical reaction, and in this case, it’s the decomposition of hydrogen peroxide). This shows that the reaction is exothermic, meaning that it gives off heat.

What is the chemical formula of lead iodide?

PbI2
Lead(II) iodide/Formula

What is lead iodide used for?

The applications of lead iodide are in printing, bronzing, mosaic gold and photography. It is also used as a detector for high-energy photons such as X- rays and gamma rays.

What method can be used to prepare lead II iodide?

Experiment – Preparation of Lead(II) Iodide Salts that are insoluble in water can be prepared by a precipitation method. That is when two clear liquids are mixed together and a reaction between them gives a solid precipitate, insoluble in water.

When lead nitrate reacts with sodium iodide sodium nitrate and lead iodide are formed?

Lead II nitrate and sodium iodide react to form sodium nitrate and lead II iodide. The balanced chemical equation is Pb(NO3)2 +2NaI —> 2NaNO3 + PbI2.

What type of reaction is lead nitrate and sodium iodide?

Precipitation reaction
Pale yellow sodium iodide solution is added to colorless lead(II) nitrate solution.

How do you test for lead nitrate and nitrates?

Nitrates can be tested for with the “brown ring test”, sulfuric acid and iron(II) sulfate (see here ). For lead you can test with the “golden rain” reaction using any iodine salt that is soluble in water (see here, they’re using lead(II) nitrate in this example). Depending on what else is in your water solution,…

How do you test for lead in water?

Extra info. The regulatory standard method for testing for lead in water uses an Atomic Absorption (AA) spectrophotometeror XRF machines(cost $30,000)(source) For testing nitrate/nitrite in water, see here.

What is the best reagent to test for lead?

Lead You can use hydrogen sulfide, $\\ce{H2S}$ to test lead. (Warning: it has rotten egg smell.) It is a common reagent and can be found in laboratory. You can also use sodium sulfide instead but it too has rotten egg smell. $$\\ce{Pb^2+ + H2S -> PbS + 2H+}$$

How do you test for NAI in alkyl halide?

1 NaI (Sodium Iodide) Test. 2 Functional Group(s): Primary and secondary alkyl halides. 3 Known(s): Alkyl bromide starting material; Alkene standard(s) for your reaction. 4 Set up a test tube rack containing 3-4 small (75mm X 12mm) test tubes. 5 ~1 ml of the sodium iodide in acetone reagent to each tube.