Miscellaneous

How do you standardize sodium thiosulfate using potassium iodate?

How do you standardize sodium thiosulfate using potassium iodate?

Take 10 ml of Potassium Iodate solution . Add 2 gm of Potassium Iodide and 5 ml of dilute H2SO4 ,keep it in dark for 10 minutes, add 2 to 3 drops of starch indicator and titrate with sodium thiosulphate using starch solution as indicator until the blue colour is disappeared.

How do you standardize kio3?

Potassium Iodate Solution Standardization

  1. Dilute 25.0 ml of the solution to 100 ml with water.
  2. To 20.0 ml of this solution add 2 g of potassium iodide and 10 ml of 1M sulphuric acid.
  3. Titrate with 0.1 M sodium thiosulphate using 1 ml of starch solution, added towards the end of the titration, as an indicator.

Which reagent is used in standardization of sodium thiosulphate?

Sodium thiosulphate solution is standardized against potassium dichromate in presence of hydrochloric acid and potassium iodide.

Why is kio3 a good 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…

Why iodometric method is used for standardization of Na2S2O3 is standardized with K2Cr2O7?

The main purpose of the experiment is to standardize Na2S2O3 solution with standard K2Cr2O7 solution. In this experiment the strength of Sodium Thiosulphate solution is determined with the help of a standard Potassium Dichromate solution. This is an oxidation and reduction reaction, as well as “Iodometric reaction”.

Is KIO3 soluble?

KIO3 is soluble in kl solution. KIO3 is insoluble in alcohol, liquid ammonia, and nitric acid. The atomic mass of potassium in KIO3 is 39.0983; iodine is 126.90447, and oxygen is 15.9993. Melting point at 560°c(1,040°F; 833 K)(decomposes).

Is KIO3 a primary standard?

Full story… 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.

What is the N factor of KIO3?

n factor of KIO3 = 5.

Why sodium thiosulfate is not a primary standard?

It should not be attacked by air. So sodium thiosulfate is not a primary standard because it is hygroscopic.

Why sodium thiosulphate is used in iodometric titration?

Iodometry is used to determine the concentration of oxidizing agents through an indirect process involving iodine as a mediator. In the presence of iodine, thiosulphate ions are quantitatively oxidized to tetrathionate ions.

What is KIO3 used for?

Potassium Iodate tablets are used at the time of a nuclear emergency; the tablets stop the thyroid gland (situated in your neck) taking up radioactive iodine, which may be released into the environment following a nuclear accident.

Why is KIO3 an oxidizing agent?

Potassium iodate is an oxidising agent and as such it can cause fires if in contact with combustible materials or reducing agents. The chemical formula for potassium iodate is KIO3. It can be prepared by reacting potassium base with iodic acid.

Why is KIO3 a good primary standard?

What is the equivalent weight of KIO3?

In this series of reactions, the equivalent weight of Potassium Iodate is one-sixth the molecular weight….

Potassium Iodate
Chemical Formula KIO3
Formula Weight 214.00
Equivalent Weight (in moderately acidic solution) 35.67 (Molar = 6 Normal)*
Equivalent Weight (in strongly acidic solution) 53.50 (Molar = 4 Normal)

What is the reaction between KIO3 and Ki?

KIO3 reacts with KI to liberate iodine which is titrated with standard hypo solution. The reactions are: (i) IO3−→I2 (Valency factor = 5/3) (ii) I2+S2O32→S4O62−+I− (Valence factor =2)

What is the primary standard used to Standardise na2s2o3?

Iodine is the standard.

What is the principle of iodometric titration?

The Basic Principle of iodometric titration is to determine the concentration of an oxidising agent in solution. iodometry involves indirect titration of iodine liberated by reaction with the analyte.In an iodometric titration, a starch solution is used as an indicator since it can absorb the I2 that is released.

What is the standardisation of sodium thiosulphate?

Standardisation of 0.1N sodium thiosulphate Take 10 ml of Potassium Iodate solution.Add 2 gm of Potassium Iodide and 5 ml of dilute H2SO4,keep it in dark for 10 minutes, add 2 to 3 drops of starch indicator and titrate with sodium thiosulphate using starch solution as indicator until the blue colour is disappeared. 1V1 = N 2V 2 2 = N 1V 1 V 2

How much K2Cr2O7 is in a mL of sodium thiosulphate?

Near end point the color will be changed from dark blue to bottle green. Each ml of 0.1 M sodium thiosulphate is equivalent to 0.04904 g of K2Cr2O7.

Is sodium thiosulphate solution standardized against potassium dichromate?

Sodium thiosulphate solution is standardized against potassium dichromate in presence of hydrochloric acid and potassium iodide.

How to prepare starch and sodium thiosulphate solution?

Preparation of sodium thiosulphate solution Dissolve 25 g of sodium thiosulphate in CO2 free water and make the volume upto 1000 ml. Keep the solution aside and filter to remove any cloudieness, if appears. Preparation of starch solution