Open with Google Docs Chemistry GIT Checkpoint 1. Unit 3 Predicting Pigmented Products Background Later in this unit, you will complete a lab to make pigments that can be used to add color to paint. pigments will be the colorful precipitate created with double replacement reactions. The pigment will be the precipitate, the solid is produced from the reaction of two aqueous solutions. We can predict precipitate formation using solubility rules. The created pigments contain ions of transition metals, metals located in the center block on the periodic table. These metals have partially filled d-orbitals, resulting in characteristic colors. Since many of the transition metals have multiple oxidation states (charges), different ions of the same element have their own characteristic color. The unique properties of transition metals allow manufacturers to use them as the pigments in paints. These colorful precipitates will be used to create paint by combining the precipitate pigment with a binder and an extender. Before the end of the unit, your group will create a plan to formulate a certain colored pigment for a piece of public art. Analysis For each of the four chemical reactions: 1. Predict the products for the following reactions that you will be conducting. 2. Balance each reaction using coefficients. 3. Use the solubility rules to determine the solid precipitate formed in each reaction. Use (s) to indicate a solid; circle the formula of the precipitate. 4. Research each of the colored precipitates ("pigments"). Note the pigment color, the common name of the color as well as other interesting or potentially useful information. Reaction 1: _CuSO4(aq) + _NaCO3(aq) Research information: Chemistry G/T Checkpoint 1: Unit 3 Predicting Pigmented Products Research information: Reaction 3: CoCl2(aq) + Na,Co, (aq) Research information: Reaction 4: Pb(NO3)2(aq) + _Kl(aq) Research information