Procedure Measure 50 mL of 0.10 M potassium chromate solution in a clean 100 mL graduated cylinder. Transfer this solution to a clean 250 mL beaker. Thoroughly wash the graduated cylinder with tap water.. Rinse the graduated cylinder with a 20 mL portion of distilled water so that the water contacts the entire inner surface of the cylinder. Discard the rinse water. Repeat this procedure with two additional 20 mL portions of distilled water. Discard the rinse water. Measure 50 mL of 0.11 M lead (ii) nitrate solution in a clean 100 mL graduated cylinder. With continuous stirring, using a glass rod, slowly pour the lead (II) nitrate solution into the potassium chromate solution. Continue to stir the mixture for 5 minutes. Weigh a clean, dry watch glass and a piece of filter paper. Record the total mass of the watch glass and paper on the Data Sheet. Place a clean filtering funnel in a funnel stand, or in a utility clamp attached to a ring stand. Fold a piece of filter paper as shown in figure 1. Fold the circle of filter paper in half. Make a second fold as shown so that the edges of the filter paper do not quite match, as shown, and so that the angle formed by the two edges of the paper should be about 5 to 10 degrees. Tear off a corner of the smallest section of the filter paper. Place the torn corner of the filter paper in the paper cone, since the mass of this piece of filter paper was included when the watch glass and filter paper were weighed. Place a 150 mL beaker under the funnel so that the stem of the funnel touches the side of the beaker. Moisten the filter paper in the funnel with distilled water from a wash bottle. Firmly press the edges of the filter paper against the funnel. Add sufficient distilled water to the funnel to fill the stem of the funnel. Using a medicine dropper, add a few drops of lead (II) nitrate solution to the reaction mixture. If some precipitate forms as the additional precipitant (the lead
Procedure Measure 50 mL of 0.10 M potassium chromate solution in a clean 100 mL graduated cylinder. Transfer this solution to a clean 250 mL beaker. Thoroughly wash the graduated cylinder with tap water.. Rinse the graduated cylinder with a 20 mL portion of distilled water so that the water contacts the entire inner surface of the cylinder. Discard the rinse water. Repeat this procedure with two additional 20 mL portions of distilled water. Discard the rinse water. Measure 50 mL of 0.11 M lead (ii) nitrate solution in a clean 100 mL graduated cylinder. With continuous stirring, using a glass rod, slowly pour the lead (II) nitrate solution into the potassium chromate solution. Continue to stir the mixture for 5 minutes. Weigh a clean, dry watch glass and a piece of filter paper. Record the total mass of the watch glass and paper on the Data Sheet. Place a clean filtering funnel in a funnel stand, or in a utility clamp attached to a ring stand. Fold a piece of filter paper as shown in figure 1. Fold the circle of filter paper in half. Make a second fold as shown so that the edges of the filter paper do not quite match, as shown, and so that the angle formed by the two edges of the paper should be about 5 to 10 degrees. Tear off a corner of the smallest section of the filter paper. Place the torn corner of the filter paper in the paper cone, since the mass of this piece of filter paper was included when the watch glass and filter paper were weighed. Place a 150 mL beaker under the funnel so that the stem of the funnel touches the side of the beaker. Moisten the filter paper in the funnel with distilled water from a wash bottle. Firmly press the edges of the filter paper against the funnel. Add sufficient distilled water to the funnel to fill the stem of the funnel. Using a medicine dropper, add a few drops of lead (II) nitrate solution to the reaction mixture. If some precipitate forms as the additional precipitant (the lead
synthesis_of_lead_chromate_lab.docx