A solution is prepared by dissolving 0.20 mol of acetic acid and 0.20 mol of ammonium chloride in enough water to make 1.0 L of solution.
Find the concentration of ammonia in the solution.
To find the concentration of ammonia in the solution, we need to first understand the chemical reaction that occurs when acetic acid (CH3COOH) and ammonium chloride (NH4Cl) are dissolved in water.
The acetic acid dissociates in water to form acetate ions (CH3COO-) and hydrogen ions (H+):
CH3COOH ⇌ CH3COO- + H+
The ammonium chloride dissociates in water to form ammonium ions (NH4+) and chloride ions (Cl-):
NH4Cl ⇌ NH4+ + Cl-
Now, the ammonium ion reacts with water to produce ammonia gas (NH3) and hydronium ions (H3O+):
NH4+ + H2O ⇌ NH3 + H3O+
In this reaction, ammonia is formed from the ammonium ion.
Since we have equal concentrations of acetic acid and ammonium chloride (0.20 mol each), the amount of ammonia formed will also be 0.20 mol.
So, the concentration of ammonia in the solution is 0.20 mol/L.