Which of the following is the correct ionic equation for the precipitation reaction between sodium iodide and silver nitrate?

Question

BlackTom AI · Accepted Answer

First, let's restate the question: Which of the following is the correct ionic equation for the precipitation reaction between sodium iodide and silver nitrate?

Option a: 'AgNO3(aq) + NaI(aq) → AgI(s) + NaNO3(aq)'. This is a full (spectator-ion included) formula equation, not an ionic equation. It lists reactants and products as intact compounds rather than separating into ions, so it does not represent the ionic behavior in solution. Additionally, it treats NaNO3 as aqueous rather than recognizing that NaNO3 remains in solution, which makes this option inconsistent with ionic framework.

Option b: 'Ag+(aq) + I-(aq) → AgI(s)'. This is the net ionic equation: it includes only the reacting ions that form the precipitate, removing spectator ions (Na+ and NO3-). It correctly shows silver and iodide ions combining to precipitate silver iodide while leaving Na+ and NO3- in solution.

Option c: 'Ag(NO3)2(aq) + 2NaI(aq) → AgI2(aq) + 2NaNO3(s)'. This depicts an unusual complex ion formation (Ag(NO3)2) and even suggests the formation of AgI2(aq) as a soluble species with a solid NaNO3, which is both chemically inaccurate for this reaction and inconsistent with typical silver iodide precipitation. In short, the species listed are not the correct ionic participants or products for this precipitation.

Option d: 'Na+(aq) + NO3(aq) → NaNO3(s)'. This portrays a formation of solid sodium nitrate from aqueous ions, which does not reflect the actual chemistry here: NaNO3 is soluble in water, and precipitation would not yield NaNO3(s). It also ignores the key driving pair (Ag+ and I- forming AgI).

In summary, option b correctly represents the driving ionic process—Ag+ and I− combine to form the insoluble precipitate AgI, while the spectator ions (Na+ and NO3−) remain in solution. The other options either fail to separate ions, imply incorrect species, or misstate the solubility and reaction partners involved.

Which of the following is the correct ionic equation for the precipitation reaction between sodium iodide and silver nitrate?单项选择题

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