Subjective Type

What happens when? Iodine is reacted with hypo solution.

Solution

Sodium thiosulphate is a colourless crystalline solid. It is sodium salt of an unstable acid, thiosulphuric acid $$(H_2S_2O_3)$$. It is also known as hypo.

Iodine solution is decolourised by sodium thiosulphate (hypo) as sodium tetrathionate and sodium iodide are formed. Both are colourless and soluble.

Hypo is oxidised by iodine quantitatively.

$$2Na_2S_2O_3+I_2\rightarrow 2NaI+Na_2S_4O_6$$

This reaction is involved in iodometric titrations in the presence of starch indicator.

SIMILAR QUESTIONS

s - block Elements (Alkali and Alkaline Earth Metals)

When sulphur is boiled with $$Na_2SO_3$$ solution, the compound formed is

s - block Elements (Alkali and Alkaline Earth Metals)

How will you bring about the following conversions? Sodium thiosulphate from sodium sulphate.

s - block Elements (Alkali and Alkaline Earth Metals)

For the preparation of sodium thiosulphate by ' spring's reaction', the reactants used are:

s - block Elements (Alkali and Alkaline Earth Metals)

For the preparation of sodium thiosulphate by Spring's reaction , the reactants used are:

s - block Elements (Alkali and Alkaline Earth Metals)

Identify the following: $$Na_2CO_3\xrightarrow {\displaystyle{ { SO }_{ 2 } }} A\xrightarrow {\displaystyle{ Na_{ 2 }{ CO }_{ 3 } }} B$$ $$\xrightarrow [\displaystyle{ \triangle }]{\displaystyle{ \text{Elemental (S)}}} C\xrightarrow {\displaystyle{ { I }_{ 2 } }} D$$ Also mention the oxidation state of S in all the compounds.

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