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 represents the general formula for an ionic hydrate?
A
M_2X_2·H_2O
B
MX_2·nH_2
C
MX·nH_2O
D
M_2X·nOH
Verified step by step guidance1
Understand that an ionic hydrate is a compound consisting of an ionic salt combined with a specific number of water molecules, which are typically represented as \( nH_2O \) where \( n \) is the number of water molecules associated with each formula unit of the salt.
Recognize that the general formula for an ionic hydrate is written as the formula of the ionic compound followed by a dot and then the water molecules, for example, \( \text{Salt} \cdot nH_2O \).
Analyze the given options to identify which one correctly shows a salt formula followed by \( nH_2O \), indicating water molecules as part of the hydrate.
Note that \( M_2X_2 \) and \( MX_2 \) represent ionic salts, but the water part must be correctly written as \( nH_2O \), not \( nH_2 \) or \( nOH \), since water molecules are \( H_2O \).
Conclude that the correct general formula for an ionic hydrate is \( MX \cdot nH_2O \), where \( MX \) is the ionic salt and \( nH_2O \) represents the water molecules of hydration.
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