Double Replacement Lab Essay

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Double Replacement Reactions & Table F When two substances undergo a chemical reaction, new substances are formed. A double replacement reaction is one type of reaction that can form soluble or insoluble products. The purpose of the lab was to figure out how the solubility of a substance (aqueous or precipitate) can be determined when a double replacement reaction happens. Precipitates are insoluble compounds. A precipitate is a solid product that comes out of solution in a chemical reaction. Precipitates usually form many small particles which cause a cloudy appearance in a solution. In this lab four different solutions (AgNO3, CuCl2, Pb (NO3)2, and K2Cr)4) were mixed together, two at a time in very possible combination. Observations of color change, bubbling, and/or solid (precipitate) formation were recorded. For each reaction in which a solid was formed, the chemical reaction was written (these were double replacement reactions since all of the reactants were compounds). The results showed that when mixing AgNO3 and Pb(NO3)2 that Reaction A had no reaction between the chemicals. Reaction B mixed AgNO3 and CuCl2 which was a PPT reaction that turned the products a white/blue color. Reaction C combined AgNO3 and K2CrO4 which formed a PPT reaction that turned an orange/brownish color. Reaction D mixed Pb(NO3)2 and CuCl2 that created a PPT reaction. Reaction E mixed Pb(NO3)2 and K2CrO4 which was a PPT reaction that was a yellowish color. Reaction F mixed CuCl2 and K2CrO4 which created a PPT reaction with a tan/brown color. Based on the results, the correct phase of a product can be determined by looking to see if it is soluble or insoluble. The aqueous phase is soluble and the solid phase is insoluble. A precipitate is formed when there is a solid in the products that is insoluble. One thing that could have caused potential error is mixing the wrong

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