Switching the water-to-soil ratio inside the slurry can change the pH by disturbing the water-colloid equilibrium, specifically the ionic energy. Using 0.01 M CaCl2 rather than water obviates this impact of water-to-soil ratio and gives a far more reliable approximation of "soil pH" that pertains to plant root development, rhizosphere https://kylerqyfpu.fitnell.com/56641289/5-easy-facts-about-water-filter-faucet-described