Silver nitrate (0.4 g) was first dissolved in 20 mL of ultrapure water, and NaCl (0.14 g) was then added to the silver nitrate solution, which resulted in a white precipitate of AgCl. The AgCl precipitate was washed thrice with ultrapure water. Sodium thiosulfate (1.6 g) and ultrapure water were added to the AgCl precipitate to dissolve it completely using ultrasonic waves. Finally, ultrapure water was added to make up the total volume to 200 mL.
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