# What is the molarity of a stock solution if 10 mL is diluted to 400 mL with a concentration of 0.5M?

You can solve this problem by calculating the dilution factor associated with your dilution.

Here

In essence, the dilution factor will tell you how concentrated the stock solution was compared with the dilute solution.

In your case, you'll have

The dilution factor method works because it's based on the underlying principle of a dilution, i.e. the concentration of the solution is decreased by Increasing the volume of the solution while keeping the number of moles of solute constant.

The equation for dilution calculations looks like this

Here

This equation can be rearranged as

This is where the dilution factor comes into play

Plug this into the above equation to get

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The molarity of the stock solution is 20 M.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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