Samples of NaF(s) and NH4Cl(s) are dissolved inseparate beakers that each contain 100 mL of water. Oneof the salts produces a slightly acidic solution. Which ofthe following equations best represents the formation ofthe slightly acidic solution?(A) Na+(aq) + 2 H2O(l) NaOH(aq) + H 3O +(aq)(B) F −(aq) + H2 O(l) HF(aq) + OH −(aq)(C) NH4+(aq) + H2O(l) NH 3 (aq) + H 3 O+(aq)(D) Cl −(aq) + H 2 O(l) HCl(aq) + OH −(aq)Unauthorized copying or reuse ofany part of this page is illegal. GO ON TO THE NEXT PAGE.-20-
Question
Samples of NaF(s) and NH4Cl(s) are dissolved inseparate beakers that each contain 100 mL of water. Oneof the salts produces a slightly acidic solution. Which ofthe following equations best represents the formation ofthe slightly acidic solution?(A) Na+(aq) + 2 H2O(l) NaOH(aq) + H 3O +(aq)(B) F −(aq) + H2 O(l) HF(aq) + OH −(aq)(C) NH4+(aq) + H2O(l) NH 3 (aq) + H 3 O+(aq)(D) Cl −(aq) + H 2 O(l) HCl(aq) + OH −(aq)Unauthorized copying or reuse ofany part of this page is illegal. GO ON TO THE NEXT PAGE.-20-
Solution
The salt that produces a slightly acidic solution is NH4Cl. When NH4Cl is dissolved in water, it dissociates into NH4+ and Cl- ions. The NH4+ ion can react with water to produce NH3 and H3O+, thereby increasing the concentration of H3O+ in the solution and making it slightly acidic. Therefore, the equation that best represents this process is:
(C) NH4+(aq) + H2O(l) NH3 (aq) + H3O+(aq)
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