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The problem from your image is asking to prepare 100 grams of a 5% aqueous solution of hydrochloric acid (HCl) using 12 M (Molar) HCl. Specifically, it asks how many grams of 12 M HCl would be used.

To solve this, we'll break it down into parts:

### 1. **Understanding the 5% w/w solution:**
   - "Weight/Weight % (w/w %) solution" means that in 100 grams of solution, 5 grams of it is the solute (HCl in this case).
   - The remaining 95 grams is water (or the solvent).

Thus, in 100 grams of a 5% HCl solution:
   - 5 grams is HCl (solute).
   - 95 grams is water.

### 2. **Relation of molarity to mass:**
   - The 12 M HCl solution indicates 12 moles of HCl per liter.
   - To convert the molarity to grams, we need the molar mass of HCl, which is about **36.46 g/mol**.

Using this, we can calculate the number of grams of HCl in a given volume.

### 3. **Find the required grams of 12 M HCl:**

Now, we know that we need 5 grams of HCl to make the solution. To find the volume of 12 M HCl that contains 5 grams, we use the formula:
\[
\text{Mass of HCl} = \text{Molarity} \times \text{Volume (L)} \times \text{Molar mass}
\]
Rearranging to solve for volume (L):
\[
\text{Volume (L)} = \frac{\text{Mass of HCl}}{\text{Molarity} \times \text{Molar mass}}
\]

Substituting the known values:
\[
\text{Volume (L)} = \frac{5 \text{ g}}{12 \text{ mol/L} \times 36.46 \text{ g/mol}} 
\]

Let's calculate that next.The volume of 12 M HCl required to provide 5 grams of HCl is approximately **0.0114 liters**, or **11.43 milliliters**.

Thus, to prepare 100 grams of a 5% w/w HCl solution, you need to use **11.43 mL of 12 M HCl**.

Would you like more details or have any questions?

Here are 5 related questions to expand on this:

1. How can we prepare a different percentage of HCl solution using the same method?
2. How do we convert between w/w%, w/v%, and molarity for solutions?
3. Why is it important to use a concentrated solution like 12 M HCl when diluting?
4. What safety precautions should be taken when working with concentrated acids?
5. Can you explain how to adjust this calculation for larger or smaller solution volumes?

**Tip:** Always add concentrated acid to water, not the other way around, to avoid exothermic reactions that can cause splashes.

To make up 100g of a 5% aqueous solution of hydrochloric acid (using 12 M HCl), how many grams of 12M HCl is used?

Learn how to calculate the amount of 12 M hydrochloric acid (HCl) required to prepare 100 grams of a 5% aqueous solution. This step-by-step guide explores solution concentration, molarity, and the relevant formulas used in chemistry to determine the necessary volume of acid.

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