In the above reaction, the parent base is Ca(OH)2 (option B).
What is a parent base?
In chemistry, a parent base or acid is defined as the base or acid which produces a salt when in combination with one another.
A parent base accepts protons or hydrogen ion from the parent acid to form a salt and water in the product.
According to this question, the following neutralization equation was given;
2HC2H3O2 + Ca(OH)2 --> Ca(C2H3O2)2 + 2H2O
In the above reaction, Calcium hydroxide is the parent base because it accepts hydrogen ion from the acid to form salt and water.
Therefore, in the above reaction, the parent base is Ca(OH)2.
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