What is the net ionic equation for the reaction between aqueous silver nitrate and aqueous potassium chloride?
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This was the answer that was provided: AgNO3(aq), KCl(aq), and KNO3(aq) are strong electrolytes and so the ionic equation is: Ag+(aq) + Cl-(aq) + K+(aq) + NO3-(aq) → AgCl(s) + K+(aq) + NO3-(aq) K+(aq) and NO3-(aq) are both spectator ions and are eliminated to yield the net ionic: Ag+(aq) + Cl-(aq) → AgCl(s) I was just wondering though how you come up with the FIRST ionic equation? Also, how do you know what a "strong electrolyte" is? Thanks
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Answer:
I was just wondering though how you come up with the FIRST ionic equation? You get this by knowing it is a double displacement reaction to start with. This is because AgCl is insoluble [ presumably you have already bookmarked a site like http://www.ausetute.com.au/solrules.html that tells you this] so it is AgNO3(aq) + KCl(aq) ---> KNO3(aq) + AgCl(s) to start with. you just then write the soluble salts [strong electrolytes] as their ions as your line 1 Also, how do you know what a "strong electrolyte" is? A strong electrolyte is a good conductor of electricity in solution. For rough guidance, this is strong acids [eg HCl, H2SO4 and HNO3], salts of strong acids and strong bases [eg NaOH, KOH]
John Sato at Yahoo! Answers Visit the source
Other answers
First you write a molecular equation with states - that is the normal equation that you write for a chemical reaction: Molecular equation: AgNO3(aq) + KCl(aq) → AgCl(s) + KNO3(aq) Write the full ionic equation: To do this you separate anything that can dissociate , into its respective ions. Anything the is (g) (l) or (s) does not dissociate is left in molecular form . The examiner is helping you by reminding you that AgNO3, KNO3 and KCl are strong electrolytes and that they dissociate completely. Not that AgCl is not in this list. Full ionic equation: Ag+(aq) + NO3-(aq) + K+(aq) + Cl-(aq) → AgCl(s) + K+(aq) + NO3-(aq) Now examine the above full ionic equation and cancel out everything that is identical on both sides of the → sign - these are the spectator ions ( K+(aq) and NO3-(aq). The net ionic equation is what remains : Ag+(aq) + Cl-(aq) → AgCl(s).
Trevor H
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