Could anyone answer any of these chemistry questions for me please? (multiple parts, any info at all is appreciated)?

I have solutions of Na2S, K2C2O4, Ba(NO3)2, KI, Ag(NO3)2, and Pb(NO3)2 in test tubes. My goal is to figure out which solution is in which test tube.

1) Does anyone know which of these solutions are acidic/basic/neutral? I cannot do a litmus paper test.

- Na2S (sodium sulfide)

- K2C2O4

- Ba(NO3)2

- KI

- Ag(NO3)2

- Pb(NO3)2

2) I reacted K2CrO4 with one of the unknown chemicals listed above(I'll call that unknown solution X)

- Solution X produced a white precipitate with Na2CO3

- White precipitate with H2SO4

- red precipitate with K2CrO4

- Did not react with KSCN

3) I reacted nh3 with Fe(NO3)3 and got a light orange solution. Is that normal?

4) I reacted H2SO4 with one of the unknown solutions I think is KI and got a white precipitate. I reacted iron nitrate with the unknown solution and it turned yellow. K2CrO4, Na2CO3, KSCN, produced no change when added to the solution.

1 Answer

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  • 3 years ago

    Flame test

    Na2S ; Flame test is for sodium (Na) which is bright yellow

    K2C2O4 ; Flame test is for potassium (K) which is a lilac flame

    Ba(NO3)2 : Flame test is for barium (Ba) which is pale/apple green

    KI + AgNO3 = KNO3(aq) + AgI(s) (Bright yellow ppt)

    2KI + Pb(NO3)2 = 2KNO3(aq) + PbI2(s) yellow ppt.

    No reaction between AgNO3 & Pb(NO3)2 because they both contain the same anion (NO3^-)

    They are all 'Salts' so they will be neutral .

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