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# GravAnal - Gravimetric Analysis of a Mixture Objective The...

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Gravimetric Analysis of a Mixture Objective: The purpose of this experiment is to determine the percent of sodium bicarbonate in a mixture composed of sodium carbonate and sodium bicarbonate. Safety Tips: Wear safety goggles at all times in the laboratory. Be careful with hot plates that are in use. Background: Gravimetric analysis is a method which is based upon the measurement of mass. There are two major types of gravimetric analysis, precipitation methods and volatilization methods. In this experiment a volatilization method will be used. A weighed sample of the starting material is heated to drive off (evaporate) a volatile product. After heating, the mass of the residue is determined and the mass of the volatile component is determined by taking the difference in mass between the starting material and the residue. In this experiment gravimetric analysis will be used to determine the percent by weight of sodium bicarbonate in a mixture of sodium carbonate and sodium bicarbonate. The volatile product here is the carbon dioxide and water vapor that evaporates from sodium bicarbonate upon heating. (see figure 1) The sodium bicarbonate in the mixture will be converted into sodium carbonate, carbon dioxide, and water vapor, and the mass of the water vapor and carbon dioxide will be determined. The mass of the sodium bicarbonate can be calculated from stoichiometric relationships using the form below. . First, you must determine how much mass was lost as volatile products, H 2 O and CO 2 . mass before heating – mass after final heating = total mass lost Since the mass lost comes from two products, we must take into account the ratio of masses between those two products.

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GravAnal - Gravimetric Analysis of a Mixture Objective The...

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