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## Sagot :

**Answer:**

0.125 M

**Explanation:**

M₁V₁ = M₂V₂

125 mL / 1000 = 0.125 L = V₁

25 + 125 = 150 mL / 1000 = 0.150 L = V₂

0.15 M = M₁

M₁ × V₁ / V₂ = M₂

(0.15) × (0.125) / (0.150) = 0.125 M

0.125 M is the answer

Taking into account the definition of dilution, the** molarity **of the diluted solution is **0.125 M**.

### Dilution

When it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.

Dilution is the process of **reducing the concentration of solute** in solution, which is accomplished by simply **adding more solvent** to the solution at the same amount of solute.

In a dilution the **amount of solute does not change**, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.

A dilution is **mathematically **expressed as:

**Ci×Vi = Cf×Vf**

where

- Ci: initial concentration
- Vi: initial volume
- Cf: final concentration
- Vf: final volume

### Final molarity

In this case, **you know**:

- Ci= 0.15 M
- Vi= 125 mL
- Cf= ?
- Vf= 125 mL + 25 mL= 150 mL

**Replacing **in the definition of dilution:

0.15 M× 125 mL= Cf× 150 mL

Solving:

(0.15 M× 125 mL)÷ 150 mL= Cf

*0.125 M= Cf*

In summary, the** molarity **of the diluted solution is **0.125 M**.

**Learn more** about** dilution**:

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