# Chemistry) Buffers and Ph differences question

• Stevo11
In summary, the Chemist is trying to prepare a 250mL buffer with a pH of 4.50 using 100mL of 0.12 mol L acetic acid and 0.10 mol L NaOH. To raise the pH to 5.1, they need to add 0.20 mol L NaOH. If the same amount of NaOH is added to 250mL of DI water, the new pH will be determined by the Henderson equation. The Chemist may need assistance in using the Henderson equation for this problem.
Stevo11

## Homework Statement

A Chemist wishes to prepare 250mL of buffer that has a Ph of 4.50. Starting with 100mL of 0.12 mol L acetic acid and a supply of 0.10 mol L NaOh.
1) explain how this can be done
3) how much 0.20 molL NaOH must e added to this buffer to raise the pH to 5.1?
3) if the same amount of 0.20 mol L NaOH were added to 250mL of Dionized water, what would the new pH be?

## Homework Equations

I know the henderson equation has to be used somewhere but I'm honestly stumped at where to even start any general push in the right direction would be seriously appreciated, It's a bonus Lab question, but I'd still like to get any extra marks I could :)

When you add NaOH to the solution of acetic acid, you neutralize it, producing sodium acetate. Just add enough to get a correct ratio given by the HH equation.

## 1. What is a buffer in chemistry?

A buffer is a solution that resists changes in pH when small amounts of acid or base are added to it. Buffers are made up of a weak acid and its conjugate base or a weak base and its conjugate acid.

## 2. How do buffers maintain a constant pH?

Buffers maintain a constant pH by reacting with any added acid or base to neutralize it. This is possible because the weak acid or base in the buffer can donate or accept protons, depending on the direction of the pH change.

## 3. What is the importance of buffers in biological systems?

Buffers are crucial for maintaining a stable pH in biological systems, such as the human body. Many biochemical reactions are sensitive to changes in pH, and a slight deviation from the optimal pH range can have detrimental effects on the organism.

## 4. How does temperature affect the effectiveness of buffers?

The effectiveness of buffers is affected by temperature because the ionization of weak acids and bases is temperature-dependent. This means that the optimal pH range of a buffer can change with temperature, and it may become less effective at extreme temperatures.

## 5. Can buffers be used in industrial processes?

Yes, buffers are commonly used in industrial processes, such as in the manufacture of pharmaceuticals, food and beverages, and cleaning products. They are also used in wastewater treatment to maintain a stable pH and prevent harmful effects on aquatic life.

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