# Question #16d0c

##### 1 Answer

You need **76 mL** of your stock silver acetate solution.

The key to doing dilution calculations is to realize that the number of moles of solute, in your case silver acetate, **remains unchanged** following a dilution.

Diluting a solution *decreases* its molarity because you're essentially *increasing* the volume of the solution while keeping the number of moles of solute **constant**.

This means that you can work backwards from the target solution to determine what volume of the stock solution you need.

Use the molarity and volume of the target solution to determine how many moles of silver acetate are present

This means that you need the stock solution to contain **0.1525 moles** of silver acetate, so you can determine its volume by

Expressed in mL and rounded to two sig figs, the answer will be

This is what the formula used for dilution calculations is all about. Here's how you'd solve using that approach

Solve for