A student tests two substances: solid $$\(\mathbf{C}\)$$ and solid $$\(\mathbf{D}\)$$. Tests on solid C Solid $$\(\mathbf{C}\)$$ is ammonium iodide. The student dissolves solid $$\(\mathbf{C}\)$$ in water to form solution $$\(\mathbf{C}\)$$. The student divides solution $$\(\mathbf{C}\)$$ into three approximately equal portions. Complete the expected observations. To the third portion of solution $$\(\mathbf{C}\)$$, the student adds an excess of aqueous sodium hydroxide. observations ................................................................................................................... ................................................................................................................................... (ii) The student warms the product from (c)(i) and tests any gas given off. observations ................................................................................................................... ................................................................................................................................... Tests on solid D Table 3.1 shows the tests and the student's observations for solid $$\(\mathbf{D}\)$$. Table 3.1

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