precipitating in central park

precipitating in central park - Sadaf Ayaz Precipitating in...

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Sadaf Ayaz Precipitating in Central Park Professor Edmund Tam Lab Partners: Natalia and Gaby 04/07/2016
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Sadaf Ayaz Professor Edmund Tam Lab Partners: Natalia and Gaby 04/07/2016 Precipitating in Central Park Observations of Reagents: 0.05 M lead nitrate – colorless liquid 0.025 M sodium carbonate – liquid water 0.1 M potassium phosphate – clear, water-like 0.25 M potassium Iodide – light, yellow liquid 0.1 M silver nitrate – colorless liquid Observations of Reactions: Reaction 1 : We used 25mL lead nitrate and 1.4mL sodium carbonate. When we added lead nitrate and sodium nitrate, the mixed solution turned cloudy. A white precipitate formed when testing the filtrate. For the second test we added 30 drops of Nickel Nitrate and no precipitate was formed and there was no color change in the solution. Therefore, we can safely conclude: Excess test for lead ion : white precipitate was formed – Positive Excess test for carbonate ion: no green precipitate was formed – Negative Reaction 2:
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We used 25mL lead nitrate and 1.4mL potassium iodide . When we added 30 drops of Potassium Phosphate, we observed that the solution turned white and cloudy, but a white precipitate was not formed. We waited a while to give the reaction time, however, we were left with a negative result upon final observation. For the second test we added 30 drops of Silver Nitrate, and we observed a yellow color change and a cloudy concentration on the top. Therefore we can safely conclude: Excess test for lead ion : white solution, cloudy. No precipitate was formed – Negative Excess test for carbonate ion: turned yellow, and a part of it concentrated on the top – Positive Observations of Tests: Second Reaction : Lead ion – It took a while to form a precipitate, but it was positive Iodide Ion – filtrate turned dirty-yellow, greenish color. Negative Yellow Lead Iodide Solid Test:
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