Answer to Question #286137 in Chemistry for khryst

Question

What is the concentration of NaCl in a solution if titration of 15.00 mL of the solution with 0.2503 M AgNO3 requires 20.22 mL of the AgNO3 solution to reach the end point?

AgNO3 (aq) + NaCl (aq) ⟶ AgCl (s) + NaNO3 (aq)

Answer 1

Solution:

Balanced chemical equation:

AgNO₃(aq) + NaCl(aq) ⟶ AgCl(s) + NaNO₃(aq)

According to stoichiometry:

1 mol of AgNO₃ reacts with 1 mol of NaCl

Moles of solute = Molarity × Volume of solution

Hence,

(0.2503 M × 20.22 mL) of AgNO₃ reacts with (Molarity of NaCl × 15.00 mL) of NaCl

Molarity of NaCl = (0.2503 M × 20.22 mL) / (15.00 mL) = 0.3374 M

Molarity of NaCl = 0.3374 M

Answer: The concentration of NaCl in a solution is 0.3374 M