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    Home > Chemicals Industry > Chemical Technology > The structure and properties of nitrite and its salt

    The structure and properties of nitrite and its salt

    • Last Update: 2021-06-17
    • Source: Internet
    • Author: User
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    1.
    Preparation

    Mix the strong acid with the nitrite solution at low temperature to obtain the nitrous acid solution
    .

    NaNO 2 +H 2 SO 4 =HNO 2 +NaHSO 4

    Passing the mixed gas of NO and NO 2 into ice water also generates an aqueous solution of nitrous acid
    .

    NO 2 +NO+H 2 O=2HNO 2

    Nitrite can be obtained by decomposition or reduction of nitrate
    .

    2KNO 3 =2KNO 2 +O 2

    Pb+KNO 3 =PbO+KNO 2

    2.
    Structure and properties

    The trans structure of nitrous acid (HNO 2 ) is more stable (Figure 12-8), and there is a double bond between the N and the terminal O (a bond σ and a π bond)
    .


    NO 2 - and O .


    FIG HN03 12-8 2 and NO 2 - Structure and π bond

    HNO 2 is a weak acid (Ka Θ =7.


    2×10 -4 ), and the potential diagram of related elements is as follows


    It can be seen that nitrite is basically non-oxidizing, while nitrous acid is both oxidizing and reducing
    .



    Nitrous acid oxidizes I - fast.


    It is generally believed that HNO 2 produces NO + in acidic solution, which is easy to approach I - and then undergo electron transfer, that is, redox products are obtained


    Nitrous acid is unstable and decomposes quickly when the temperature is close to 0℃
    .

    KNO 2 and NaNO 2 are relatively stable and easily soluble in water; however, heavy metal salts have poor stability and are difficult to dissolve in water
    .


    For example, the pale yellow AgNO 2 is slightly soluble and decomposes when it is above 140°C


    AgNO 2 =Ag+NO 2

    NO 2 - complexing ability, many ions can be generated with a transition metal ion such as soluble of Na .


    3
    [of Co (NO 2 ) .
    6
    ] complex as a colorless, sparingly soluble K .


    Related link: Nitrogen oxides

     

     

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