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Крахмал

йод

обесцвечивание

шоу

дети

химия просто

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[music]

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hello everyone, today we will make a

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qualitative reaction to starch, starch

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caused color when interacting with

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iodine, so you can determine the

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starch content in bread,

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potatoes and even in honey, well, let's go

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for the experiment, we will need a solution of

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starch, solution and honey, hot and

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cold water water

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[music]

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at the end I will show you the reaction, place

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vanya

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and we will find out how the solution reacts to

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hot and cold water

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tap master at the starch solution

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add a drop of iodine

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I will do this with a glass rod you

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can use a pipette or a finger or an

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ear stick

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as a blue color appears

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the solution is concentrated and therefore the color of the

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clowns is a

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qualitative reaction to starch

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[music]

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let's now heat the blue solution,

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take hot water

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and wait a little

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[music]

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[applause] [music

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] [

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music]

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the solution gradually becomes discolored

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[music]

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[music]

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[music] ]

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so rocking and evil now we put

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cold water

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[music]

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painting design since the resulting

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connection is unstable

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[music]

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cold water the solution becomes blue again

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this is an excellent example that shows a

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chemical reaction and their

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dependence on temperature vivid experiments for you

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friends

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[music]

Description:

Капля йода окрашивает крахмальный клейстер в синий цвет. Чем больше крахмала в растворе, тем насыщеннее и темнее получается цвет жидкости ( до темно-фиолетового). Это качественная реакция на йод и крахмал. Таким образом можно обнаружить содержание крахмала в продуктах питания, капнув каплю йода, к примеру, на творог или мед (хлеб, картофель...). Йод + Крахмал → Соединение темно-синего цвета I2 + (C6H10O5)n → I2*(C6H10O5)n желтый + прозрачный → темно-синий

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