0.1914 g of an organic acid is dissolved in about 20 mL of...

0.1914 g of an organic acid is dissolved in about 20 mL of water 25 mL of 0.12 N NaOH is required for the complete neutralization of the acid solution. The equivalent weight of the acid is
(a) 63.8
(b) 64.0
(c) 65.8
(d) 66.2

Key Concepts

Equivalents in Titration Calculations

In titration calculations, the concept of equivalents is used to relate the amounts of acid and base reacting. The total number of equivalents of the titrant added, which is calculated by multiplying its normality by its volume, equals the number of equivalents of the substance being analyzed at the equivalence point. This equality is essential for determining properties like the equivalent weight of the analyte.

Equivalent Weight

Equivalent weight is defined as the mass of a substance that reacts with or supplies one mole of hydrogen ions (H+) or electrons in a redox reaction. It is calculated by dividing the mass of the substance by the number of equivalents it provides, making it a key concept in determining reactive capacity during titrations.

Acid-Base Titration

Acid-base titration is an analytical method used to determine the concentration or amount of an acid or base by reacting it with a standard solution of known concentration. The titration continues until the equivalence point is reached, where the amount of titrant added is chemically equivalent to the amount of substance present in the analyte.

Normality

Normality is a concentration unit that is equivalent to the number of equivalents per liter of solution. It is especially useful in titrations, where the concept of equivalents allows for a straightforward relationship between the titrant and the analyte based on their reactive capacities.

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