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Does Cl⁻ Dissolve in Silver, or Does It React Differently?

Posted by Daoyang
I am in a high school chemistry classroom, and the teacher is holding a silver coin and a beaker of hydrochloric acid. "Can chloride ions Cl⁻ dissolve in silver?" she asked. Please tell me the answer, thank you.
  • StormRider
    StormRider
    Does Cl⁻ Dissolve in Silver, or Does It React Differently?
    Chloride ions (Cl⁻) do not "dissolve" in silver in the traditional sense, but they can react chemically with silver. When Cl⁻ comes into contact with silver (Ag), it forms silver chloride (AgCl), an insoluble white precipitate. This reaction occurs because silver ions (Ag⁺) and chloride ions combine to form a compound with low solubility in water, as described by the equation:
    Ag⁺(aq) + Cl⁻(aq) → AgCl(s).

    Silver itself is a metal, and Cl⁻ is an ion typically found in aqueous solutions (e.g., saltwater). The process is a precipitation reaction, not dissolution, as AgCl separates from the solution rather than forming a homogeneous mixture. This reaction is why silver jewelry or coins tarnish in the presence of chloride-containing substances (e.g., sweat, seawater), forming a dull AgCl layer. Thus, Cl⁻ does not dissolve silver metal but reacts to form an insoluble compound.
  • Logan
    Logan
    Chloride ions ​​don’t dissolve​​ in solid silver. Instead, they react to make ​​insoluble silver chloride (AgCl)​​—the grey "pox" on jewellery!

    ​​Science Behind Daag (Stain):​​
    ​​Surface Reaction, Not Dissolution​​:
    Ag + Cl⁻ → ​​AgCl (s)​​ ↓ Instantly!
    Electrons jump: Ag⁺ and Cl⁻ bond tighter than Bollywood couples.
    ​​Why No Dissolving?​​
    Cl⁻ size too big for Ag crystal lattice gaps.
    Silver’s "dulhan material" purity (99.9%) hates intruders!
    ​​
    ​​Real-Life Proofs:​​
    ⚪ ​​Jewellery Tarnish​​:

    Sweat (NaCl) + humid air → ​​AgCl grey patches​​ in chains.
    Rub with multani mitti (abrasive) to scrape it off!
    🧪 ​​Laboratory Test​​:
    Add NaCl to AgNO₃ solution → ​​milky precipitate​​ (AgCl). No dissolution—just powder party!

    ☠️ ​​Industrial Nightmare​​:
    Silver refinery tanks + seawater chloride → ​​20% wastage​​ as AgCl sludge!
    ​​Exceptions? Only Under Attack!​​
    ⚠️ ​​Molten Silver + Cl₂ Gas​​:
    Forms AgCl vapour—toxic! (Used in nano-coatings, not jewellery.)
    🔥 ​​Extreme Heat​​:
    AgCl decomposes >455°C → silver metal + chlorine gas (fumes kill!).
    ​​
    How to Save Your Silver​​:
    ✅ ​​Prevention​​:
    Store in ​​airtight boxes​​ with anti-tarnish strips (absorbs Cl⁻).
    Never wear while swimming (sea Cl⁻ = Ag’s enemy!).
    ⚠️ ​​Cleaning Warning​​:
    Avoid lemon/vinegar—acids accelerate corrosion!
  • BlackTaiga
    BlackTaiga
    Silver, a transition metal with atomic number 47, is known for its lustrous appearance and excellent electrical conductivity. Chloride ion, Cl⁻, is a negatively charged ion commonly found in table salt (NaCl). When silver comes into contact with chloride ions, an intriguing chemical reaction occurs. Silver chloride (AgCl) forms, characterized by its white precipitate and low solubility in water. This reaction can be represented as:

    {Ag}^+ (aq) + {Cl}^- (aq) --- {AgCl} (s)

    The physical properties of AgCl, such as its insolubility, make it a key component in photographic films and certain batteries. However, under specific conditions, like the presence of ammonia, silver chloride can dissolve, forming a complex ion:

    {AgCl} (s) + 2{NH}_3 (aq) --- {Ag}({NH}_3)_2]^+ (aq) + {Cl}^- (aq)

    This duality in behavior highlights the importance of understanding both chemical reactivity and physical properties. It also raises questions about the broader implications of such reactions in industrial applications and environmental chemistry.
  • BorisStone
    BorisStone
    No, Cl⁻ (chloride ions) don’t exactly dissolve in silver. Instead, they react with silver to form a precipitate—specifically, silver chloride (AgCl). When you mix a solution containing Cl⁻ with silver ions (like from silver nitrate), you get a white, cloudy solid—that’s the AgCl forming right away.

    This reaction is actually super useful in chemistry experiments, especially in qualitative analysis where we’re trying to detect halide ions. It’s also widely used in water testing and photographic processes, since AgCl is light-sensitive and was historically used in film development.

    Now in terms of human health, this reaction doesn’t have a direct impact unless you’re dealing with silver-based medical products. In small amounts, silver compounds are used in wound care for their antibacterial properties, but AgCl isn’t something you’d want inside your body in large quantities.

    In the environment, silver and chloride reactions are relevant in waste treatment and pollutant tracking. And in chemical manufacturing, silver chloride can be a byproduct in the production of silver-based catalysts, mirrors, and electrical conductors.

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