The equivalent weight of a base is calculated as its molar mass divided by its acidity (the number of replaceable hydroxide ions, OH⁻). The molar mass of Ba(OH)₂ is calculated as: Atomic weight of Ba + 2 (Atomic weight of O + Atomic weight of H) = two replaceable OH⁻ ions, so its acidity is 2. Equivalent weight = Molar mass / Acidity = 171.3 g/mol / 2 = 85.65 g/equivalent. Rounding to one decimal place gives 85.7 g/equivalent, which matches option A.
The equivalent weight of Ba(OH)₂ is (given, atomic weight of Ba is 137·3)
Asked in UPSC CDS 2 2018 · Topic: Acid, Base and Salt (Strength of Acids and Bases (Strong and Weak Acids/Bases))
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