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Lab# 7 - Hypothesis All positive ions are insoluble in...

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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.
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