a. In the first column (pH), predict whether an aqueous solution of the compound

ID: 884974 • Letter: A

Question

a. In the first column (pH), predict whether an aqueous solution of the compound would be acidic (a), basic (b) or neutral (n). Refer to your lab manual, pp. 30-31.

b. In the corresponding cells in the table write “NR” for no reaction, meaning the two solutions would not react to form a precipitate, or indicate what reaction would occur (e.g. “blue ppt” for blue precipitate, “white ppt” for white precipitate, “bubbles” for gases being formed, etc.).

Reagents Unknowns pH KOH AgNO3 BaCl2 NaCl NH3(aq)Na2SNa2SO4 H2SO4 HCI HNO3 H2SO4 KOH NH3 Na2S NaCl CuCl2 BaCl2 AgNO3 Cu(NO3)2 a Fe(NO3)s Nal Na2SO4 Na2CO3 These may be slightly acidic because the water may have some carbon dioxide from the air dissolved in

Explanation / Answer

please consider the answer for each unknown columnwise

HCl-a,soluble ppt (KCl),NR,NR,NR,ppt dissolves(NH4Cl),bubbles(H2S(g)),NR,NR

HNO3-a,soluble ppt (KCl),NR,NR,NR,ppt dissolves(NH4Cl),bubbles(H2S(g)),NR,NR

H2SO4-a,soluble ppt (KCl),NR,NR,NR,ppt dissolves(NH4Cl),bubbles(H2S(g)),NR,NR

KOH=b,NR,ppt soluble(KNO3),soluble ppt(KCl),NR,NR,NR,NR,soluble ppt(K2SO4)

NH3=b,NR,ppt soluble(NH4NO3),soluble ppt(NH4Cl),NR,NR,NR,NR,soluble ppt((NH4)2SO4)

Na2S-b,NR,black ppt,black ppt,NR,NR,NR,NR,bubbles(h2s gas)

Nacl=n,NR,NR,NR,NR,NR,NR,NR,NR

cUCL2=a,soluble ppt,(KCl),NR,NR,NR,soluble ppt(NH4Cl),black ppt, blue ppt,NR

BaCl2=n,ppt dissolves(KCl),NR,NR,NR,ppt dissolves (NH4Cl),black ppt,white ppt (BaSO4),NR

AgNO3=n,ppt dissolves(AgCl),NR,NR,NR,ppt dissolves (NH4Cl),black ppt,white ppt (Ag2SO4),NR

Cu(NO3)2=a,ppt dissolves(KNO3,),NR,PPt dissolves,ppt dissolves,ppt dissolves(NH4NO3),black ppt,blue ppt,NR

Fe(NO3)3=a,ppt dissolves(KNO3,),NR,PPt dissolves,ppt dissolves,ppt dissolves(NH4NO3),black ppt,yellow ppt (Fe2(SO4)3),NR

NaI=n, ppt dissolves(KI),yellow ppt(AgI),NR,NR,NR,NR,NR,bubbles(HI)

Na2SO4=n,ppt dissolves(K2SO4),white ppt (AgSO4),white ppt (BaSO4),NR,white ppt (NH4)2SO4),NR,NR,NR

Na2CO3=n,ppt dissolves(K2CO3),white ppt (AgCO3),white ppt (BaCO3),NR,white ppt (NH4)2CO3),NR,NR,NR

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a. In the first column (pH), predict whether an aqueous solution of the compound

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