alleryStart learning →Mixing solutions of CaCl2 and AgNO3 gives solid AgCl. What does the net ionic equation state?
AAg+ and Cl- combine to give AgCl(s)
BCa2+ and Cl- combine to give CaCl2(s)
CAg+ and NO3- give solid AgNO3
DCa2+ and NO3- give Ca(NO3)2(s)
Answer & Solution
Correct answer: A. Ag+ and Cl- combine to give AgCl(s)
1. Cancel the spectator ions Ca2+ and NO3- from the complete ionic equation.
2. What remains is 2Cl- + 2Ag+ giving 2AgCl(s).
3. Dividing through by 2 gives the smallest whole numbers: Ag+ + Cl- giving AgCl(s).
4. This holds no matter which soluble salts supplied the silver and chloride ions.
5. CaCl2 and Ca(NO3)2 are soluble, so neither forms a solid here.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 4 "Stoichiometry of Chemical Reactions", section 4.1 Writing and Balancing Chemical Equations_
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