# Question #9cb3f

##### 1 Answer

#### Answer:

See details below.

#### Explanation:

Whenever you are given a **volume** with a given **concentration**, when you take the product of these two quantities, you will get moles of that particular entity.

In each of the different scenarios, you are given **moles** of the solute. Then you are asked to find the new **molarity** (concentration) when

**Working example of 125 mL of 0.251 M HCl**

**First step: Convert #mL->Liters# (used for all volumes)**

**Conversion factor used**

#(given cancel "mL of solute")/(1)* (1*10^-3 L)/(cancel "mL") = "volume in Liters"#

**Second step : Find moles**

When you add water, you are essentially diluting the solution. If we look at what molarity is,

you can clearly see the relationship between volume and molarity. When you

To find the **new molarity** or concentration, first, add the volume of water,

**New Volume** :

Take the number of moles of HCl and divide by new volume to get new molarity.

**New Molarity:**

Repeat this for every given problem.