A hospital is unable to properly clean its bedding and surgeons cannot scrub in effectively. You must determine the source of the problem.
![Photo of a sink with a person washing their hands. Image from Pixabay.](/pbl/sites/files/pbl/styles/full_width_m/public/shared/Hard%20Water%20Pixabay.jpg.webp?itok=TQgLT8oK)
Problem written by: Andrew Lo
Curriculum items covered: Complex ions, complexometric titration, unit conversions.