I have a Yr 11 class conducting a streamwatch prac over this term. A standard sodium chloride solution has been supplied with the kit but it is not calibrating properly. It is called Conductivity standard 12.9mS/cm of sodium chloride and the teacher wants me to make up another solution.
Does anyone know what mS/cm of sodium chloride is and how to make it up?
![Huh ? :?](./images/smilies/huh.gif)
Rosemary