The proper amount of dissolved carbon dioxide in water is critical for maintaining a healthy aquatic ecosystem. All aquatic life has an impact on and is in turn impacted by the dissolved carbon dioxide concentration in a system, so tracking the concentration and changes in concentration can help scientists to better understand the health of an aquatic system and the organisms that exist within it. Kit contains enough materials to perform 40 tests. Aligned to the Next Generation Science Standards (NGSS)* Disciplinary Core Ideas: PS1.A; PS1.B Performance Expectations: MS-PS1-2 Cross Cutting Concepts: Structure and Function Engineering Practices: Developing and Using Models Kit Contents: 3 Plastic Pipettes 3 Reaction Vessel 3 Collection Bottle 1 Measuring Tube 1 Titrator 15mL Phenolphthalein Indicator 50mL Potassium Hydroxide Reagent DOT Info: Small quantity exemption 173.4 THIS PACKAGE CONFORMS TO 49 CFR 173.4 for domestic highway or rail transport only *"Next Generation Science Standards" is a registered trademark of Achieve. Neither Achieve nor the lead states and partners that developed the Next Generation Science Standards was involved in the production of, and does not endorse, this product. WARNING: This product can expose you to chemicals including phenolphthalein, which is known to the State of California to cause cancer. For more information go to http://www.P65Warnings.ca.gov.