Explain how you would mix 10 mls of a 0.5M NaCl solution. The materials you have to work with are: 1M NaCl (10 mls available), distilled water (as much as you want), various sizes of graduated...

Explain how you would mix 10 mls of a 0.5M NaCl solution. The materials you have to work with are: 1M NaCl (10 mls available), distilled water (as much as you want), various sizes of graduated cylinders and beakers.

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jeew-m | College Teacher | (Level 1) Educator Emeritus

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Amount of NaCl moles in 10ml of 0.5M naCl

`= 0.5/1000xx10 = 0.005 `

 

So we need to get 0.005moles in 10ml of distilled water to have a 0.5M NaCl solution.

 

Amount of NaCl moles in 10ml of 1M naCl `= 1/1000xx10 = 0.05`

So we have 0.01 moles in 10ml.

What we want is 0.05 moles in 10ml.

 

Now add 10ml of distilled water to the 1M NaCl solution.

Now the 0.01moles which initially at 10ml is now at 20ml of solution.

 

So we have 0.01moles in 20ml solution. 

So if we take 10ml out of this we would have 0.01/2 = 0.005moles of NaCl solution in 10ml.

 

0.005moles in 10ml solution is 0.5M solution. That is what we want.

 

Note:

To measure the solution and add known amount of distilled water we can use cylinders.

To mix solution we can use beakers.

 

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