Ag(S2O3)2 + NaCl(aq)
The precipitate of AgCl also dissolves in Na2S2O3(aq) due to the formation of the complex ion [Ag(S2O3)2]³⁻.
Therefore, both HBr and HCl react with AgNO3(aq) to give a precipitate that dissolves in Na2S2O3(aq).

" /> Ag(S2O3)2 + NaCl(aq)
The precipitate of AgCl also dissolves in Na2S2O3(aq) due to the formation of the complex ion [Ag(S2O3)2]³⁻.
Therefore, both HBr and HCl react with AgNO3(aq) to give a precipitate that dissolves in Na2S2O3(aq).

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Question:

Which of the following hydrogen halides react(s) with AgNO3(aq) to give a precipitate that dissolves in Na2S2O3(aq)?

HBr

HCl

HF

HI

Solution:

Reaction of HCl and HBr
HBr + AgNO3(aq) → AgBr(s) + HNO3
AgBr(s) + 2Na2S2O3(aq) → Na3[Ag(S2O3)2] + NaBr(aq)
The precipitate of AgBr dissolves in Na2S2O3(aq) due to the formation of the complex ion [Ag(S2O3)2]³⁻.
HCl + AgNO3(aq) → AgCl(s) + HNO3
AgCl(s) + 2Na2S2O3(aq) → Na3Ag(S2O3)2 + NaCl(aq)
The precipitate of AgCl also dissolves in Na2S2O3(aq) due to the formation of the complex ion [Ag(S2O3)2]³⁻.
Therefore, both HBr and HCl react with AgNO3(aq) to give a precipitate that dissolves in Na2S2O3(aq).