Question

You wish to make a 0.449 M hydrobromic acid solution from a

stock solution of 3.00 M hydrobromic acid. How much
concentrated acid must you add to obtain a total volume of 75.0
mL of the dilute solution?
mL

Answer 1

11.25 mL

Step-by-step explanation:

To determine the volume of concentrated hydrobromic acid (HBr) needed to prepare a 0.449 M solution with a total volume of 75.0 mL, we can use the following equation:

```

M1 * V1 = M2 * V2

```

where:

* M1 is the molarity of the concentrated solution

* V1 is the volume of the concentrated solution

* M2 is the molarity of the dilute solution

* V2 is the volume of the dilute solution

Substituting the known values into the equation, we get:

```

3.00 M * V1 = 0.449 M * 75.0 mL

```

```

V1 = (0.449 M * 75.0 mL) / 3.00 M

```

```

V1 = 11.25 mL

```

Therefore, 11.25 mL of concentrated HBr is needed to prepare a 0.449 M solution with a total volume of 75.0 mL.

**Answer:** 11.25 mL