A student tests two substances: solid $$\(\mathbf{C}\)$$ and solid $$\(\mathbf{D}\)$$. Tests on solid C Solid $$\(\mathbf{C}\)$$ is ammonium iodide. The student dissolves solid $$\(\mathbf{C}\)$$ in water to form solution $$\(\mathbf{C}\)$$. The student divides solution $$\(\mathbf{C}\)$$ into three approximately equal portions. Complete the expected observations. To the first portion of solution $$\(\mathbf{C}\)$$, the student adds about $$\(1 \mathrm{~cm}^{3}\)$$ of dilute nitric acid followed by a few drops of aqueous barium nitrate. observations .......................................................................................................................... ..........................................................................................................................................

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