# How much of 8.00 mol/L sulphuric acid must you add to an empty 750. mL bottle to obtain a concentration of 1.50 mol/L?

##### 1 Answer

#### Answer:

If you wish to produce 750 mL of the 1.50 M solution, you will need 140.6 mL of the 8.00 M solution.

#### Explanation:

The key to solving this problem is to realize that the number of moles of

Since we know the desired concentration and volume (I assume we are to make a full 750 mL of the 1.50 M solution), we can use this to find the number of moles

To find the volume of the concentrated solution needed, we start with the definition of molarity:

and rewrite it as

Place this in the bottle and top it up to 750 mL with water.

(Practical note: Put about 500 mL of water into the bottle first, then add the acid before topping it up. It is safer that way! )