How do you standardize potassium iodate?
Potassium Iodate Solution Standardization
- Dilute 25.0 ml of the solution to 100 ml with water.
- To 20.0 ml of this solution add 2 g of potassium iodide and 10 ml of 1M sulphuric acid.
- Titrate with 0.1 M sodium thiosulphate using 1 ml of starch solution, added towards the end of the titration, as an indicator.
Why potassium iodate is a primary standard?
Potassium Iodate is an oxidizing agent and a good primary standard with the one drawback of having a relatively low equivalent weight. It is used primarily as a stable source of Iodine, which is liberated in the presence of Iodide ion and acid, in the titration of Thiosulfate and Sulfite solutions. Full story…
What is the purpose of adding potassium iodide in the preparation of iodine solution?
Potassium iodate (KIO3) is used to add iodine to some salts so that the iodine is not lost by oxidation.
How do you test the purity of potassium iodate?
The potassium iodate sample is dried at 105~110°C for 2 hours in a weighing bottle, then placed in a desiccator with silica gel and cooled to room temperature for weighing. The sample is weighed in a plastic cup using a M3 micro-balance. The relative standard uncertainty of this weighing process is 4.5×10–6.
Which reagent is used as indicator for standardization of potassium iodate?
A slight excess of both Potassium Iodate and Potassium Iodide is added, and the Iodine generated (see the first equation above) is then titrated with standard Sodium Thiosulfate using Starch indicator….
| Potassium Iodate | |
|---|---|
| Chemical Formula | KIO3 |
| CAS No. | 7758-05-6 |
What is the PH of kio3?
3.2. When heated to decomposition it emits very toxic fumes.
Why is it necessary to add KI before the titration of the organic layer?
Solid potassium iodide (KI) is added during the titration to prevent loss of iodine vapor from the open flask. Iodide ion from the KI combines with iodine to form the nonvolatile triiodide ion.
Why KI is added in iodometric titration?
Potassium iodide must be added in excess to keep iodine dissolved. Once all the ascorbic acid has been consumed, any excess iodine will remain in solution. Since aqueous iodine solutions are brown in colour, iodine can act as its own indicator.
What colour is potassium iodate solution?
Potassium iodide is a white crystalline salt with chemical formula K I. Potassium Iodide is oral antithyroid agent used in the prevention of radioactive iodine uptake. When it comes in contact with air it turns yellow because it reacts with oxygen and carbon dioxide to make iodine and potassium carbonate.
Which standard solution is used in iodometric titration?
In an iodometric titration, a starch solution is used as an indicator since it can absorb the I 2 that is released. This absorption will cause the solution to change its colour from deep blue to light yellow when titrated with standardised thiosulfate solution.
Is potassium iodate a strong base?
Potassium iodide is an ionic compound made of potassium ions and iodide ions. So it does not contain hydrogen ions or hydroxide ions. Therefore, it is not an acid nor a base, but rather a salt.
What is the standardization of potassium iodide?
Potassium Iodate Solution Standardization. Dilute 25.0 ml of the solution to 100 ml with water. To 20.0 ml of this solution add 2 g of potassium iodide and 10 ml of 1M sulphuric acid. Titrate with 0.1 M sodium thiosulphate using 1 ml of starch solution, added towards the end of the titration, as an indicator.
How to prepare potassium iodate solution from starch?
Weight exactly about 0.10-0.15g of dry potassium iodate and transfer it to Erlenmayer flask. Add 2 g of (iodate free) potassium iodide. Add 10 mL of 1M hydrochloric acid solution and swirl the soltion. Titrate swirling the flask, until a pale yellow. Add 5 ml of the starch solution. Titrate swirling the flask, until blue color disappears.
How do you titrate potassium iodide solution?
Potassium Iodate Solution Standardization Dilute 25.0 ml of the solution to 100 ml with water. To 20.0 ml of this solution add 2 g of potassium iodide and 10 ml of 1M sulphuric acid. Titrate with 0.1 M sodium thiosulphate using 1 ml of starch solution, added towards the end of the titration, as an indicator.
How much potassium iodate is in a 1000ml solution?
Potassium Iodate Solution Preparation Weigh accurately 10.7 g of potassium iodate, previously dried at 110°C to constant weight, in sufficient water to produce 1000 ml. Standardize the solution in the following manner.