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    2023-WAEC-CHEMISTRY-PRACTICALS-ANSWERS!l
    (1)

    =============================

    (2)
    (2a)
    TEST; C + distilled water + shake

    OBSERVATIONS; It dissolves to give a colourless or clear solution

    INFERENCE; Soluble salt suspected

    (2ai)
    TEST; Solution C + litmus paper

    OBSERVATIONS; It has no effect on both blue and red litmus paper

    INFERENCE; Neutral solution

    (2aii)
    TEST; solution C + Fehling solution A and B + heat

    OBSERVATIONS; It gives a black red colour

    INFERENCE; Reading agent confirmed

    (2bi)
    TEST; D + heat

    OBSERVATIONS; It turns yellow on heating and white on cooling

    INFERENCE; ZnO is present

    (2bii)
    TEST; D + dilute Hcl + heat

    OBSERVATIONS; It dissolves completely to give a clear or colourless solution

    INFERENCE; Solution chlorides of Zn³+, Al³+ is present

    (2biii)
    TEST; Solution D + NaOH in drops and then in excess

    OBSERVATIONS; It gives white gelatinous precipitate. The precipitate is soluble in excess.

    INFERENCE; Al³+, Zn²+ present.
    Al³+, Zn²+ present .

    (2biv)
    TEST; Solution D + NH3 in drops and then in excess

    OBSERVATIONS; It gives white gelatinous precipitate. The precipitate is soluble in excess NH3

    INFERENCE; Al³+, Zn²+ is present.
    Zn²+ confirmed.

    =============================

    (3ai)
    – Formation of a precipitate; Sodium hydroxide reacts with lead nitrate to form lead(ii) hydroxide as a precipitate.
    Pb(NO3)2 + 2NaOH –> Pb(OH)2 + 2NaNO3

    – Cloudiness or opacity; As the lead(ii) hydroxide precipitate forms, the solution may become cloudy or opaque due to the presence of the solid particles suspended in the liquid

    (3aii)
    – Formation of precipitate; Iron(iii) Fe(OH)3 is insoluble in water and appears as a reddish brown precipitate.
    – Colour change; Colour change form yellowish to reddish brown

    (3b)
    – Obtain a small amount of benzoic acid
    – Prepare a melting point apparatus
    – Fill the capillary tube with the sample of benzoic acid powder
    – Insert the capillary tube unit the melting point apparatus
    – Begin heating the temperature is increased at a slow rate you allow pressure observation of the melting point
    – Observe the melting point
    – Repeat the process to ensure accuracy
    – Record the melting point

    (3)


    =============================


    Completed!.



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    Master Solution May 17, 2023 Categories: WAEC 41


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