Determine whether or not adding 0.020 mol of naoh exceed the capacity of the buffer.

No addition of of will not exceed buffer capacity.

Further explanation:

Buffer capacity refers to the amount of acid or base that a buffer can neutralizebefore its pH changes appreciably. In general, the maximum buffer capacity exists when the concentrations of a weak acid and its conjugate base are kept large and approximately equal to each other. The buffer range is the pH range over which a buffer effectively neutralizes added acids and of and maintains a fairly constant .  

As henderson–hasselbalch equation suggests when the ratio falls to 0.10, then decreases by 1 unit. If the ratio increases to a value of 10, then increase by 1 unit.

The ionization of a hypothetical weak acid is given as follows:

If one starts with and , then on adding the concentration of increases by this amount while the concentration of decreases by and the concentration of increases by . Therefore the net concentration of acid that remains at equilibrium is given as follows:

The ratio of is calculated as follows:

The ratio of is 2.75. Hence as there is no appreciable fall in this ratio so the buffer capacity is not exceeded upon addition of of .

Learn more:

1. Balanced chemical equation:

2. Number of covalent bonds does nitrogen formed with its unpaired:

Answer details:  

Grade: College

Subject: Chemistry

Chapter: Molecular structure and chemical bonding

Keywords: Buffer capacity, buffer, pH, Henderson–HasselBalch equation, ratio, and HA.

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