Question
Explain how anhydrous copper(II) sulfate $\left(\mathrm{CuSO}_4\right)$ can act as an indicator for moisture.
Step 1
Anhydrous copper(II) sulfate ($\mathrm{CuSO}_4$) is a white crystalline solid that is hygroscopic, meaning it has the ability to absorb moisture from the environment. Show more…
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Most transition metal ions are colored. For example, a solution of $\mathrm{CuSO}_{4}$ is blue. How would you show that the blue color is due to the hydrated $\mathrm{Cu}^{2+}$ ions and not the $\mathrm{SO}_{4}^{2-}$ ions?
A weather indicator can be made with a hydrate of cobalt(II) chloride, which changes color as a result of the following reaction. $$ \left[\mathrm{Co}\left(\mathrm{OH}_{2}\right)_{6}\right] \mathrm{Cl}_{2}(\mathrm{~s}) \rightleftharpoons\left[\mathrm{Co}\left(\mathrm{OH}_{2}\right)_{4}\right] \mathrm{Cl}_{2}(\mathrm{~s})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{g}) $$ $\mathbf{1}$ blos Does a pink color indicate "moist" or "dry" air? Explain.
What is the effect of shaking dilute $\mathrm{H}_{2} \mathrm{SO}_{4}$ with a small quantity of anhydrous $\mathrm{CuSO}_{4}$ ? (a) The white solid dissolves to form a colourless solution $\square$ (b) The white solid dissolves to form a green solution $\square$ (c) The white solid dissolves to form a blue solution $\square$ (d) The white solid turns blue but does not dissolve
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