1.) The most abundant anions in estuarine water (river+sea water) are chloride and sulphates. Since silver chloride has a better solubility than silver sulphate, hence, the predominent species in the solution will be silver chloride. However, nitrates are even more soluble than chlorides, but they are in trace amount in the sample and hence, even if silver nitrate is formed, it will be in lower concentration as compared to silver chloride.
2.) Silver chloride has a limited solubility of 1.26 x 10-5 M at 25 °C in water and hence, the concentration of dissolved Ag (I) ion cannot exceed this value. However, increasing the temperature may increase its solubility.
3.) Silver carbonate is more soluble than silver chloride and the concentration of Chloride ion is very low in sample B. Silver hydroxide is not stable in water and decomposes to silver oxide. Hence, the silver nanoparticles will be better coated with silver chloride. Also, Ct=1 mM which is less than actual concentration of Cl- ion (0.003 M) in sample B. It means that chloride gets bound to the surface of silver nanoparticles as AgCl.
Problem 1. Silver Nanoparticle Fate and Toxicity Several recent efforts to understand the potential risks of...