An aqueous solution contains 0.25 M hydrofluoric acid. One Liter of this solution could be converted into a buffer by the addition of: (Assume that the volume remains constant as each substance is added.) 0.12 mol HCIO4 0.25 mol NalI 0.26 mol NaF 0.26 mol HCIO,

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**Creating a Buffer Solution from Hydrofluoric Acid**

An aqueous solution contains **0.25 M hydrofluoric acid**.

## Objective:
Convert one liter of this solution into a buffer by adding an appropriate substance.

(Assume that the volume remains constant as each substance is added.)

### Choices for substances to add:
- [ ] **0.12 mol HClO₄**
- [ ] **0.25 mol NaI**
- [ ] **0.26 mol NaF**
- [ ] **0.26 mol HClO₄**
- [ ] **0.062 mol Ca(OH)₂**

### Explanation:
A buffer solution consists of a weak acid and its conjugate base or a weak base and its conjugate acid. In this context, you have **hydrofluoric acid (HF)**, which is a weak acid.

To form a buffer solution, you need to add a substance that will provide the conjugate base of HF, which is the fluoride ion (F⁻). 

Among the choices, **0.26 mol NaF** is the correct option because it will dissociate in water to provide F⁻ ions, thus forming a buffer with HF.
Transcribed Image Text:**Creating a Buffer Solution from Hydrofluoric Acid** An aqueous solution contains **0.25 M hydrofluoric acid**. ## Objective: Convert one liter of this solution into a buffer by adding an appropriate substance. (Assume that the volume remains constant as each substance is added.) ### Choices for substances to add: - [ ] **0.12 mol HClO₄** - [ ] **0.25 mol NaI** - [ ] **0.26 mol NaF** - [ ] **0.26 mol HClO₄** - [ ] **0.062 mol Ca(OH)₂** ### Explanation: A buffer solution consists of a weak acid and its conjugate base or a weak base and its conjugate acid. In this context, you have **hydrofluoric acid (HF)**, which is a weak acid. To form a buffer solution, you need to add a substance that will provide the conjugate base of HF, which is the fluoride ion (F⁻). Among the choices, **0.26 mol NaF** is the correct option because it will dissociate in water to provide F⁻ ions, thus forming a buffer with HF.
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