Hello Mohammed, not sure I understand if this could help. Is there a chemical reaction or simply a dissolution. If a simple dissolution, you pose the final density as the sum of mass over the sum of volume, you solve the resulting equation. A generalized formulae is in this book Applied Math: Theories, Methods and Practices, etc ISBN: 978-613-7-37853-3, page 65, Chap 6. Hope this helps.

Unfortunately, you cannot directly calculate the COD concentration (Chemical Oxygen Demand) solely based on the amount of glucose added to distilled water.

Here's why:

• COD is a measure of the total amount of oxygen required by microorganisms to decompose organic matter in water. While glucose is readily biodegradable, its contribution to COD depends on various factors not captured by its concentration.
• These factors include: Presence of other organic compounds: Distilled water wouldn't have any other organic matter, but in real-world scenarios, water samples might contain additional organic materials that influence COD. Biodegradability: Not all organic matter is equally biodegradable. Even for glucose, some complex structures might take longer for microbes to break down, impacting the oxygen demand measured in COD.

However, there are alternative approaches to estimate COD: