--- title: VV-032: The Chemistry of Extraction — The Importance of pH, Acids, and Alkalis in Solution Preparation! description: Understanding pH and its role in extractions category: science-deep-dives author: Ravishankar Karuppiah published_at: 2026-07-29T16:28:17.118+00:00 canonical: https://newviva.in/blog/chemistry-of-extraction --- # VV-032: The Chemistry of Extraction — The Importance of pH, Acids, and Alkalis in Solution Preparation! **Published on:** 7/29/2026 **Category:** science deep dives **Author:** Ravishankar Karuppiah --- ## VV-032: The Chemistry of Extraction — The Importance of pH, Acids, and Alkalis in Solution Preparation! If you visit any natural farming farm in South India, you can see a variety of plastic barrels: fish waste fermented with jaggery, leaves rotting in water, or neem seeds soaked in cow urine. If you ask that farmer, "Why are you using this particular liquid?" most answers will be: "This is what they told us at the seminar!" Most farmers approach natural fertilizer preparation like some kind of magic powder art. But nature does not run on magic; it runs on the laws of **Biochemistry**! To extract minerals, hormones, and proteins from plant and animal tissues, we need a **Solvent**. Plain water is a good solvent for many things, but it has limitations—it is poor at dissolving fats, oils, and insoluble minerals. If you understand the **pH** of liquids (is it acidic or alkaline?) and how **Osmotic Pressure** works, you can accurately extract nutrients like a lab scientist, rather than operating on guesswork. --- ### 1. Soaking in Water: Limited Extraction (pH ~7.0) Putting leaves or manure in plain water and soaking them for weeks is a very common method. But do you know what happens there chemically? The pH of water is neutral (~7.0). Water does not have the chemical strength to break down the thick cell walls of plants (Cellulose) or insoluble minerals. Because there is neither acid nor alkali, putrefactive bacteria that thrive in anaerobic conditions often proliferate there. They consume the nitrogen in the leaves and convert some of it into **Ammonia (NH3)** and **Ammonium (NH4+)**, as well as **Hydrogen Sulfide (H2S)** gases in small amounts. While some ammonia can escape as gas at very high pH, most of it stays in solution as ammonium. However, this process is inefficient for nutrient extraction, and the foul smell indicates loss of some volatile compounds and potential growth of undesirable microbes. --- ### 2. Acid Extraction: Dissolving Minerals (pH 2.5 – 4.5) When we use natural acids—vinegar (Acetic Acid), lemon juice (Citric Acid), or fermented buttermilk (Lactic Acid)—as solvents, the chemistry changes significantly. ``` Eggshell + Vinegar / Lemon Juice → Plant-available Calcium + Water/CO2 ``` * **Chemical Background:** Acids are rich in Hydrogen ions (H+). These ions react with insoluble minerals like Calcium Carbonate (CaCO3) found in eggshells, releasing calcium ions into solution. This makes the calcium water-soluble and more available for plant uptake. * **What does it release?:** * **Calcium:** It converts eggshells, oysters, and other carbonate-based materials into a water-soluble form that plants can absorb. * **Micronutrients:** Weak acids can also help release some micronutrients like Iron, Zinc, and Manganese from plant tissues, forming organic complexes (chelates) that are moderately stable. --- ### 3. Alkaline Extraction: Releasing Protein, Silica & Certain Compounds (pH 8.5 – 10.0) The direct opposite of acid are alkaline solvents—primarily **Cow Urine** (pH 8.5–9.2, rich in Urea and Carbonates) or **Lye water** (dilute sodium hydroxide from wood ash). * **Chemical Background:** Alkaline solutions with high pH are rich in Hydroxyl ions (OH-). This helps break down the thick cell walls of plants, denatures proteins, and breaks them down into Amino Acids. It is particularly effective for extracting proteins and softening plant fibers. * **What does it release?:** * **Protein & Nitrogen:** It helps extract amino acids from nitrogen-rich leaves like Neem, Pungam, and Gliricidia. * **Silica (Silicic Acid):** Alkaline solutions can dissolve *amorphous* (non-crystalline) silica found in husk, straw, and bamboo leaves, releasing it as soluble silicates. However, crystalline silica (like sand or quartz) is not dissolved by weak alkalis. * **Certain plant compounds:** Some alkaloids and insect-repellent compounds are better extracted in alkaline conditions, while others are better in acidic conditions. It depends on the specific chemical nature of each compound. * **Best Example:** Cow urine acts as a mild alkaline solvent, helping extract certain compounds from herbal leaves and neem seeds, while its natural antimicrobial properties may help suppress some harmful bacteria when used appropriately. --- ### 4. Osmotic Extraction: Preserving Hormones and Enzymes (Sugar Fermentation) The fermentation method using jaggery or molasses (Fish Amino Acid) is neither acid nor alkali—this is **Osmotic Extraction**. * **Chemical Background:** When sugar is added in an amount equal to the weight of plant or animal material, a powerful **Osmotic Gradient** is created. Because there is a high sugar concentration outside the cells, water and water-soluble compounds inside the cells are drawn out through the cell membrane. * **What does it release?:** * **Growth Hormones:** This method can help extract delicate growth hormones like Auxins and Cytokinins from tender plant tips, as the mild osmotic stress does not completely destroy them. * **Best Example:** *Fish Amino Acid* extracts a range of water-soluble compounds, including amino acids, enzymes, and some hormones from fish, acting as a growth stimulant for crops when properly fermented. --- The lesson this tells you is: do not approach fertilizer preparation like a cooking recipe. When you choose the right chemical solvent for the nutrient you want to extract, your farm fertilizers will transform from foul-smelling liquids into effective biological fertilizers! We started by saying that since farmers don't understand science, we only tell them what they need, and today we have reached a state where anyone can say anything. We must not allow that anymore. Clear science in farming will elevate all of us. We'll talk more. Note – Please share this with all the farmers you know and in all farming groups. A social change requires everyone's contribution. **Regenerative Agriculture** is our future. Let's journey together. Thank you. Ravishankar Karuppiah New ViVa Bio Nutrients www.newviva.in 934 204 9144