Acknowledgements: Determining the hardness of river water by EDTA titration

Grateful acknowledgement is made to the following sources: 

  • Figure 1: The Open University
  • Figure 2: The Open University
  • Figure 3: The Open University
  • Figure 4: Kate Bradshaw/The Open University

Every effort has been made to contact copyright holders. If any have been inadvertently overlooked the publishers will be pleased to make the necessary arrangements at the first opportunity.