Hypothesis: All positive ions are insoluble in phosphate solutions. Exception of NH 4 and alkaline. All phosphate ions are insoluble in carbonate solutions except NH 4 and alkaline. Findings & Observations: First, we added 2 mL of deionized water to the cultured well plate. Then, we added just enough crystals to fit the tip of the spatula. In the cultured well plate we placed the following salts: Ba + , Ni + , Co + , and Fe + . Here are descriptions of how each salt looked before and after it was added to the deionized water: 1. Ba +- Started out white. When added to the deionized water, it sunk down to the bottom of the plate and turned into small silver balls. 2. Ni +- A green powder; when added to the water, it dissolved slightly and turned the water green. 3. NH 4 +- Stayed white the whole time. 4. Co +- Small rich maroon crystals; sunk down to the bottom of the plate and dissolved. 5. Fe 3 +- Started out jet black. Looked chalky and it stuck to the spatula. When it was added to the water, it turned yellow. After we recorded this information, we took two more cultured well plates.
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