One of the economically valuable products made from coconut shells is shell charcoal. Shell charcoal is obtained from pyrolysis (carbonisation). Pyrolysis technology is the combustion of biomass in conditions without oxygen. This pyrolysis process is in the form of liquid, gas and solid. The solid product of this process is charcoal (char) which is then called carbonization. In this process, carbonized coconut shells will produce solids in the form of carbon, as well as distillate which is a heterogeneous mixture of liquid smoke and tar. This solid form of carbon has the potential to be processed into activated carbon. Activated carbon can be used for various industries, including the pharmaceutical industry, food, beverage, water treatment, and others. Not much has been done to manufacture activated carbon, in terms of the raw material potential and its use as well as the market potential which is quite large. In terms of quantity, it can be seen that the manufacture of activated carbon has bright prospects for meeting domestic needs as well as non-oil and gas export commodities (Setiaji, 2005). Activated carbon is a product that is widely used domestically, where nearly 70% of activated carbon products are used for refining in the sugar, coconut oil, pharmaceutical and chemical industry sectors. In addition, activated carbon is also widely used for water purification processes and other industries (Pari, 1995). This study will use a solution (NH4)2 CO3 1M and 2M to act as activators in a chemical way, namely by soaking the carbon before being activated. It is hoped that the metal attached to the charcoal can be exchanged by NH cations4-. Therefore, it is necessary to investigate the concentration of (NH4)2CO3 1M and 2M to produce good quality activated carbon, seen from the physical and chemical characteristics of the carbon produced, one of which is the reduction of Fe metal as a carbon impurity mineral. The aims of the research are: 1. Determine the conditions (NH4)2 CO3 as an activating agent that produces carbon from coconut shell pyrolysis which is free of Fe metal. 2. Enlarge the absorption capacity of activated charcoal with activation treatment at 5000C. From the research data, it was found that the content of Fe metal in charcoal without activation was more than the content of Fe metal in activated charcoal. The higher the concentration of the solvent, the more Fe metal content is exchanged with ions, in this case NH ions4+. The higher the washing temperature is raised, the higher the mobility of the ions from the solution which facilitates the exchange of ions in it, and the higher the concentration of the solution (NH4)2 CO3 washing, the affinity for ion exchange that occurs in it will be even greater. The absorption capacity of activated charcoal for iodine is lower than the absorption capacity that has been determined according to the Industrial Standards in Indonesia