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Potassium Iodide Formula

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Last updated date: 16th Jul 2024
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Potassium Iodide Formula

Students often look for the resources that make them more knowledgeable and take their preparation for the exams in the right direction.  Vedantu once again has come forward for the help of the students and has made available Potassium Iodide Formula article on its website. The article is prepared by expert teachers who have a good deal of teaching experience. The PDF of the article is also available on Vedantu's website which could be downloaded for free. It could be accessed on any device and doesn’t require any registration fee. Now the preparation of the student would never be hampered since she can study from anywhere at any time.


Potassium Iodide

Potassium Iodide is one of the most common compounds used in Chemistry. This inorganic compound is white crystalline salt which is used in many fields like medicine, commercial and industrial applications. It is an ionic compound that is produced by  treating potassium hydroxide (KOH) with iodine. It is soluble in water. It is used as a nutritional supplement in animal feeds and  in the human diet. The chemical formula of potassium iodide is KI and it participates in several important chemical reactions.

Potassium Iodide- Chemical Formula

Potassium Iodide is a metal halide composed of potassium and iodine. (potassium and iodine formulae are K+ and I- respectively. The bond between them is ionic. Potassium has an oxidation number of +1 and iodide has an oxidation number of -1, So, the formula for potassium iodide is KI.

The chemical formula for potassium iodide


Molar Mass

166.0028 g/mol


3.12 g/cm3

Melting Point

681 ⁰C

Boiling Point

1330 ⁰C


Soluble in water

Calculation of Molar Mass: The molecular formula of potassium iodide is KI, Potassium has an atomic weight 39.0983 and Iodine has an atomic weight 126.90447, adding both of them we get: ( potassium iodine formula are K and I respectively)

126.90447 + 39.0983 = 166.0028.

Potassium Iodide can be produced in industries by treating KOH with iodine.


Structure of Potassium Iodide

(Image will be Uploaded Soon) (Image will be Uploaded Soon)

Uses of Potassium Iodide

  • It is a natural supplement for the human and animal diet.

  • It is added to certain salts so that iodine content is not lost during the oxidation process.

  • It is also helpful in protecting the body’s thyroid gland in the neck.

  • It is also used in photography, in the preparation of Silver Iodide.


Reactions Involving Potassium Iodide

2CuSO4 + 4KI → 2Cul + I2 + 2K2SO4

2KI + Cl2 → 2KCL + I2

2KI + Br2 → 2KBr + I2

The Vedantu Edge

Potassium Iodide Formula article prepared by Vedantu would benefit students immensely. Most of the time it is seen that the students find trouble understanding the concepts due to the difficult language of the content. Despite putting in their handwork, they fall short of the desired score, and are left feeling disappointed.

Scoring good grades in the exams is easier than you think. All the toppers in the class don’t do anything special but just know which resource to pick.  You can also be one of the toppers in the class and totally impress your parents and teachers just by reading the Potassium Iodide Formula article for the examination. This is because the expert teachers at Vedantu have taken care that the content of the article is very easy to understand and students do not have to end up mugging up the whole concept. The students would be enabled to practically grasp the concepts and understand what the examiner is asking for in the exams.

Know Your Challenge  

It is always better to test the depth of the water before you get into them. The same is with the exams. The students must always begin their preparation with knowledge of their subject as well as the exam they would attempt.  To do this one should  read the syllabus and the previous year question paper, with the intent to have a better understanding of the exam.

Read the Syllabus

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Reading Previous Year Question Papers

The teachers at Vedantu highly recommend the students go through the previous questions papers if they want to score impeccable grades in the exams.  Therefore, the expert teachers highlight major benefits one can get from reading the previous year question paper, they are: 

  • Precise studying approach

  • Weed out unnecessary information

  • Identifying and choosing to study from relevant resources.

  • Organizing and developing a systematic strategy for success

  • Better Time management while solving the questions in exams

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Potassium Iodide (KI) is an important agent for protection against thyroid-related health effects. It is used with silver nitrate to make silver iodide (AgI), a chemical used in making film photography. Potassium Iodide is also used in organic synthesis mainly in the preparation of aryl iodides in the Sandmeyer reaction (Organic Chemistry).

FAQs on Potassium Iodide Formula

1. What will be observed when:

(i) Potassium iodide is reacted with lead nitrate?

(ii) Identify the type of reaction involved.

(iii) Give a balanced chemical equation for the potassium iodide equation.

(i) When potassium iodide is added to aqueous lead nitrate,  potassium nitrate, and a precipitate of lead iodide is formed which is yellow in colour.

The reaction involved is: Pn(NO3)2 + 2KI → PbI + KNO3

(ii) The type of reaction involved is a double displacement reaction or precipitation reaction.

(iii) Balanced equation Pn(NO3)2 + 2KI → 2PbI + 2KNO3

(chemical formula potassium iodide is (KI))

2. What are some common side effects of potassium iodide (KI)?

Skin rashes, Swelling of the salivary glands, diarrhoea, abdomen pain, headache. An allergic reaction can have more serious symptoms which include fever and joint pains; swelling in some parts of the body (face, lips, tongue, throat, hands, or feet); trouble in breathing,  or swallowing, shortness of breath. Excess usage can also harm pregnant women.

3. Is potassium iodide chemically electrically neutral?

Potassium iodide is an ionic compound and the chemical formula potassium iodide is KI. It is electrically neutral because the formula KI has a net zero charge. (+1 + -1 = 0), it has equal amounts of positive and negative charge. Potassium forms a positive ion and iodine forms a negative ion.