Answer: The effective range of a buffer is one unit on either side of the value of the acid. Explanation:A buffer works best if the concentration of acid and base is equal. The ratio of the concentration of conjugate base to the acid must be approximately in the range of 0.10 to 10.

## How long does a buffer last?

Unopened buffers typically have a shelf life of 2 years, opened buffers 3 – 6 months and alkaline buffers (pH 10 or higher) 1 month, as their pH changes noticeably through contact with carbon dioxide in the air. Always use fresh buffer solution, store buffers in closed bottles and never use them after the expiry date.

## What factors influence the effectiveness of a buffer?

Answer:The effectiveness of a buffer depends upon two factors namely,(i) The amount of acid and its conjugate base relative to each other. (ii) The absolute concentration of the acid and its conjugate base.

## What are the characteristics of an effective buffer?

Characteristics of Good Buffers

• pKa. The pKa is the logarithmic form of the acid dissociation constant of the weak acid in the buffer.
• Solubility.
• Membrane Impermeability.
• Minimal Salt Effects.
• Well-behaved Cation Interactions.
• Stability.
• Non-Toxicity.

## What does buffer capacity depend on?

The buffer capacity depends essentially on 2 factors: Ratio of the salt to the acid or base. The buffer capacity is optimal when the ratio is 1:1; that is, when pH = pKa. Total buffer concentration.

## Does buffer capacity depend on concentration?

Although the useful pH range of a buffer depends strongly on the chemical properties of the weak acid and weak base used to prepare the buffer (i.e., on K), its buffer capacity depends solely on the concentrations of the species in the buffered solution.

## Which of the following solutions has the highest buffer capacity?

(D) 0.821 M HF and 0.909 M NaF has the greatest buffering capacity.

## How does a buffer function?

A buffer is a solution that can resist pH change upon the addition of an acidic or basic components. It is able to neutralize small amounts of added acid or base, thus maintaining the pH of the solution relatively stable.

## Which one of the following is an example of buffer solution?

Sodium bicarbonate and carbonic acid.

## Which among the following is best buffer?

Buffer capacity of solution is maximum under the following conditions :

• [Salt] = [Acid] (in acid buffer)
• [Salt] = [Base] (in base buffer)
• Now, the condition B involving equal concentrations of salt and base should be most efficient buffer.

## What represents a buffer system?

Buffer systems are systems in which there is a significant (and nearly equivalent) amount of a weak acid and its conjugate base—or a weak base and its conjugate acid—present in solution. The addition of a strong acid will cause only a slight change in pH due to neutralization.

## Does a buffer donates H+?

The correct answer here is that a buffer D. donates H+ ions when conditions become too basic and accepts H+ ions when conditions become too acidic….

## How do you make a pH 7 buffer solution?

For pH=7.00 : Add 29.1 ml of 0.1 molar NaOH to 50 ml 0.1 molar potassium dihydrogen phosphate. Alternatively : Dissolve 1.20g of sodium dihydrogen phosphate and 0.885g of disidium hydrogen phosphate in 1 liter volume distilled water.