# How can I prepare 0.250 L of 0.085 M potassium dichromate?

##### 1 Answer

Here's how you'd go about doing this:

You know that molarity is defined as the number of moles of solute divided by the total volume of the solution. Let's try and do this intuitively first.

If you want to make **1 L** of **0.085 M** potassium dichromate solution, you need to add **0.085 moles** of **1 L** of solution. This will give you

Now, since you are dealing with **0.250 L**, which is *4 times less moles* of

Using the formula will give you

Knowing that

So, adding **6.18 g** of potassium dichromate to enough water to make **0.250L** will get a **0.085 M** solution.