Multiple Choice
Which of the following is the correct chemical formula for barium hydroxide octahydrate?
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3. Chemical Reactions
Naming Ionic Hydrates
Multiple Choice
Which of the following is the correct chemical formula for copper(II) sulfate hydrate?
A
CuSO4 · 2H2O
B
CuSO4 · 5H2O
C
CuSO4 · H2O
D
Cu2SO4 · 5H2O
Verified step by step guidance1
Identify the cation and its charge: Copper(II) indicates copper with a +2 charge, written as Cu^{2+}.
Recognize the anion: Sulfate is SO_4^{2-}, which balances the +2 charge of copper, so the formula for copper(II) sulfate is CuSO_4.
Understand what a hydrate is: A hydrate is a compound that includes water molecules integrated into its crystal structure, represented as \(\cdot\) nH_2O, where n is the number of water molecules.
Recall the common hydrate form of copper(II) sulfate: The well-known hydrate is copper(II) sulfate pentahydrate, which means it has 5 water molecules attached, written as CuSO_4 \(\cdot\) 5H_2O.
Compare the given options to the correct formula CuSO_4 \(\cdot\) 5H_2O and eliminate incorrect ones based on the number of water molecules and the correct formula for copper(II) sulfate.
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