What is the molarity of a HCl solution if the addition of excess AgNO₃ to a 20.0 mL sample of the solution yields 0.113 g of AgCl?

Question

Quizplus · Accepted Answer

The balanced chemical equation for the reaction between HCl and AgNO3 is:

HCl + AgNO3 → AgCl + HNO3

From the equation, we can see that 1 mole of HCl reacts with 1 mole of AgNO3 to produce 1 mole of AgCl. The molar mass of AgCl is 143.32 g/mol. Therefore, the number of moles of AgCl produced in the reaction is:

0.113 g AgCl × (1 mol AgCl/143.32 g AgCl) = 0.000789 mol AgCl

Since the reaction is between HCl and AgNO3 in a 1:1 mole ratio, the number of moles of HCl in the 20.0 mL sample can be calculated as follows:

0.000789 mol AgCl × (1 mol HCl/1 mol AgCl) = 0.000789 mol HCl

The volume of the sample is 20.0 mL or 0.0200 L. Therefore, the molarity of the HCl solution is:

Molarity = moles/volume = 0.000789 mol/0.0200 L = 0.0394 M

The correct answer is C) 0.0394 molar.

What Is the Molarity of a HCl Solution If the Addition