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    IDENTIFYING THE Pb++ BASIC RADICAL PRESENT IN GIVEN INORGANIC SALT

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    1. Experiment 15: IDENTIFYING THE Pb++ BASIC RADICAL PRESENT IN GIVEN INORGANIC SALT
    2. OBJECTIVE:
    3. TO IDENTIFY THE BASIC RADICAL PRESENT IN GIVEN INORGANIC SALT
    4. APPARATUS REQUIRED
    5. CHEMICALS REQUIRED
    6. THEORY
    7. PROCEDURE
    8. OBSERVATION
    9. 1. Preliminary test:
    10. Group Separation Table
    11. 2. Confirmatory test:
    12. Test of Pb++ ion
    13. Reactions involved:
    14. RESULT
    15. CONCLUSION
    16. PRECAUTION

    Experiment 15: IDENTIFYING THE Pb++ BASIC RADICAL PRESENT IN GIVEN INORGANIC SALT

    OBJECTIVE:

    TO IDENTIFY THE BASIC RADICAL PRESENT IN GIVEN INORGANIC SALT

    APPARATUS REQUIRED

    CHEMICALS REQUIRED

    • Dil. HCl
    • H2S
    • NH4OH
    • KI
    • H2SO4
    • NH4Cl
    • K2CrO4

    THEORY

    Qualitative inorganic analysis is concerned with the detection and identification of radicals present in inorganic salt or a mixture of salts. Inorganic salts are the outcome of the neutralization of acids with base. Each inorganic salt consists of two parts. The part contributed by acid is called acid radical or anion and the part contributed by base is called basic radical or cation. For example, in sodium chloride, which can be obtained by the neutralization of base NaOH with acid HCl, Na+ is the basic radical and Cl– is the acid radical.

    PROCEDURE

    The original solution was prepared by dissolving the given salt sample in water. The sample was subjected to several tests for the detection of the basic radical of the salt.

    OBSERVATION

    1. Preliminary test:

    a. State: Solid
    b. Odour: Odourless
    c. Colour: Odourless
    d. Solubility: Soluble in water

    Group Separation Table

    ExperimentObservationInference
    1. 2 ml of the original solution was taken in a clean and dry test tube and a few drops of dil. HCl was added to it.White ppt. is formedPresence of Group I metal ions (May be Pb++, Hg+, Ag+)

    2. Confirmatory test:

    Test of Pb++ ion

    ExperimentObservationInference
    1. 2 ml of the original solution was taken in a clean and dry test tube and a few drops of dil. H2SO4 was added to it.White ppt. was formed which was soluble in hot ammonium acetatePresence of Pb++
    2. 2 ml of the original solution was taken in a clean
    and dry test tube and a few drops of dil. K2CrO4 solution was added to it.    		Yellow ppt. was obtained which was soluble in
    NaOH solution.    		Presence of Pb++
    3. 2 ml of the original solution was taken in a clean and dry test tube and a few drops of dil. KI solution was added to it.Yellow ppt. was obtained
    which dissolved when boiled and reappeared
    when cooled.    		Presence of Pb++

    Reactions involved:

    Pb^{++} + H_{2}SO_{4} \rightarrow \underset{White\ ppt.}{PbSO_{4}} + 2H^{+}\\
Pb^{++} + K_{2}CrO_{4} \rightarrow \underset{Yellow\ ppt.}{PbCrO_{4}} + 2H^{+}\\
Pb^{++} + 2KI \rightarrow \underset{Yellow\ ppt.}{PbI_{2}} + 2H^{+}\\

    RESULT

    Hence, the sample was identified as Pb++ basic radical.

    CONCLUSION

    Hence, we can test the basic radicals of a salt by wet ways testing the original solution with several reagents.

    PRECAUTION

    1. Concentrated solutions should be handled carefully.
    2. The colour of the precipitate should be observed carefully.
    3. Check whether the original solution is clear and transparent.
    Check out Grade 12 Chemistry Notes Here

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