Iodine test

The iodine test is used to test for the presence of starch. When treated with IKI solution—iodine dissolved in an aqueous solution of potassium iodide—the triiodide anion (I3) complexes with starch, producing an intense blue/purple colour. The colour can be detected visually with concentrations of iodine as low as 2×10-5M at 20 °C. However, the intensity of the color decreases with increasing temperature and with the presence of water-miscible organic solvents such as ethanol. The test cannot be performed at very low pH due to the hydrolysis of the starch under these conditions.

See also

  • Starch indicator
  • Lugol's Iodine
  • Counterfeit banknote detection pen
  • References

    Further reading

  • http://antoine.frostburg.edu/chem/senese/101/redox/faq/starch-as-redox-indicator.shtml
  • Vogel's Textbook of Quantitative Chemical Analysis, 5th edition.
  • External links

  • Iodine test at Braukaiser
  • Podcasts:

    PLAYLIST TIME:

    Id/Hindsight

    by: Snapcase

    We were those people
    Created upon synthetic dreams of economic merit
    But we are now the pariahs
    Recreated upon the nostalgia of a future exile
    An exile to an unknown home
    We are your savages
    The so-called uncivilized
    We are the untamed
    We are the pariahs
    Come watch the stars with me
    And so I know that it's been told that I sold my soul
    Deny my solitude
    I can't make it alone
    I admit to you, I can't make it alone
    And I need you to know I can't
    How I have forsaken you
    How I deserted you
    Stranded, I deserve to be
    With my accomplishments, I abandoned you
    Come live to die with me
    I can't
    We can




    Latest News for: iodine test

    3,100 kg adulterated ghee seized in Ahmedabad: 7 ways to identify fake ghee at home

    The Times of India 28 Mar 2025
    119640095Water test ... 118608704Salt test ... If the ghee has turned red it means it is adulterated.Iodine test. Add two drops of iodine solution to ghee if it turns purple then the ghee has a presence of starch in it.Thumb and Embed Images Courtesy.

    FDA seizes 239kg of suspected substandard paneer in Nashik

    The Times of India 25 Mar 2025
    ... primary test of iodine, the substance turned blue, indicating that it contained starch.'Since the food item was unfit for consumption, a sample of the material was sent to the laboratory for testing.

    Sick of fake paneer in fast food? Make this crispy Imli-Paneer Hot Dog at home!

    Hindustan Times 19 Mar 2025
    But before you go testing every block of paneer with iodine strips, let’s talk about the real solution. making your own delicious paneer dishes at home ... Crispy, tangy homemade paneer hot dog ... It’s perfect for a weekend gathering or a cosy family dinner.

    Hyperhidrosis Treatment Market 2032: Clinical Trials, EMA, PDMA, FDA Approvals, Drugs Market, Prevalence, Medication, Statistics, ...

    GetNews 12 Mar 2025
    "Hyperhidrosis Treatment Market" ... In April 2023, announced a study to evaluate the effect of antiperspirant to treat residual limb hyperhidrosis with the emphasis on the utility of the iodine-starch test to identify the location of the sweating ... 1 ... 2 ... 3.

    Kosher Salt Is Actually Just Big Salt

    The Atlantic 08 Mar 2025
    After a series of tests, doctors figured it out. She was iodine-deficient ... Recently, however, doctors have started reporting more cases of iodine-deficient hypothyroidism—and our salt preferences may be at least partially to blame.
    • 1
    ×