Soil pH can be determined by different methods such as, 1) Saturation Soil Paste Method , 2) Soil Water Suspension Method and 3) Soil 0.01 M CaCl2 suspension Method. Which of these methods is most accurate, and gives highly reproducible results and why

Achemist reacted 57.50 grams of sodium metal with an excess amount of chlorine gas. the chemical reaction that occurred is shown. na + cl2 → nacl if the percentage yield of the reaction is 86%, what is the actual yield? show your work, including the use of stoichiometric calculations and conversion factors.