LEVEL 06 · LESSON 02
Concentration concepts
See it
Concentration expresses an amount of a substance relative to a defined volume or amount of solution. Common forms include mass per volume, molarity, and stock-to-working relationships. The Academy focuses on interpreting the unit correctly before calculation.
Understand it
mg/L and g/L differ by a factor of 1,000.
Molar concentration depends on molecular amount, not simply mass.
The same chemical can appear as a stock concentration and a much smaller final concentration.
Important boundary
Do not mix concentration units in one calculation without explicit conversion.
Try it
Explain the concept in your own words, then identify what plant, explant, stage, units, source, or observation context would need to be preserved before applying it.
Lesson quiz
Apply it
Connect this lesson to an actual MyTCLab record: what fields would you need in order to know later exactly what happened and why?