Experiments performed of calcium carbonate production by passing carbon dioxide through within calcium hydroxide mixture prepared in deionized water are considered at low to high temperature each at a time. In this paper, a built fuzzy interface model of inputs pH, time and temperature with output reaction conversion is constructed. Considering a constant temperature, fuzzy inference of carbon dioxide consumption is orderly inference. Various membership functions, each at a time, are placed to find representation with the process output. Broader shoulder membership function response is found closing.