Determining Cl- and Ag+ Concentrations in A Solution

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SUMMARY

The discussion focuses on determining the concentrations of Cl- and Ag+ ions in a KCl solution using a galvanic cell setup. A silver strip was immersed in the solution, and a standard Zn2+(aq) | Zn(s) half-cell was connected to measure the cell emf after adding 0.100 M AgNO3(aq). The experiment concluded that the concentration of Ag+ can be calculated based on the moles added and the total volume, while the concentration of Cl- can be derived from the remaining moles after the reaction. The method outlined is valid for calculating the concentrations.

PREREQUISITES
  • Understanding of galvanic cells and electrochemistry
  • Knowledge of Ksp (solubility product constant) for AgCl
  • Familiarity with molarity calculations and stoichiometry
  • Basic principles of redox reactions and emf measurement
NEXT STEPS
  • Study the calculation of cell emf in galvanic cells
  • Learn about the solubility product constant (Ksp) and its applications
  • Explore the principles of electrochemical titrations
  • Investigate the effects of temperature on solubility and reaction rates
USEFUL FOR

Chemistry students, laboratory technicians, and researchers involved in analytical chemistry and electrochemistry who are interested in ion concentration determination methods.

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Homework Statement


A is an aqueous solution of KCl(aq) with unknown concentration. The
following experiment was carried out at 25°C to determine the concentration
of Cl- (aq) in A, and the Ksp of AgCl(s)

Step 1: A half-cell was made by dipping a silver strip into 100.0 cm3
of A.

Step 2: A galvanic cell was constructed by connecting the half-cell made in
Step 1 to a standard Zn2+(aq)  Zn(s) half-cell with a suitable salt bridge.

Step 3: 0.100 M of AgNO3(aq) was added in portions from a burette to A. After
each addition of AgNO3(aq), the emf of the galvanic cell was measured.

When 8.0 cm3
of AgNO3(aq) had been added to A, what is the cell emf
(E) and the concentration of Ag+(aq) and Cl-
(aq) in the resultant solution?

[/B]

Homework Equations

The Attempt at a Solution


i just simply cal the [Ag+] added to the solution and by (mole added)/[total volume (108cm3)]
and [Cl-] by (mole remained after reaction)/[total volume(108cm3)]
is it correct? or need other specific equation to cal this problem?
 
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