# Chemical Forums

## Chemistry Forums for Students => High School Chemistry Forum => Topic started by: parisa-fateh on February 12, 2018, 02:44:52 PM

Title: concentration calculation
Post by: parisa-fateh on February 12, 2018, 02:44:52 PM
I have a solution with 10 mM CTAC(Cetyltrimethylammonium chloride solution).I want to brought this solution to 50 mM CTAC. How much of CTAC 100 mM should I add to this solution to reach the final concentration of 50 mM CTAC?
Title: Re: concentration calculation
Post by: sjb on February 12, 2018, 04:48:49 PM
I have a solution with 10 mM CTAC(Cetyltrimethylammonium chloride solution).I want to brought this solution to 50 mM CTAC. How much of CTAC 100 mM should I add to this solution to reach the final concentration of 50 mM CTAC?

What are your thoughts? How much 10 mM  solution do you have? Or how much 50 mM solution do you need?
Title: Re: concentration calculation
Post by: parisa-fateh on February 13, 2018, 05:40:05 AM
I have 3 ml of 10 mM.
Title: Re: concentration calculation
Post by: Borek on February 13, 2018, 05:56:34 AM
How many moles is that? How many moles do you need in the final solution? How many moles you need to add to your solution?
Title: Re: concentration calculation
Post by: parisa-fateh on February 14, 2018, 05:15:02 AM
I know only the final concentration(50mM) and I don't have it's volume.so how can I calculate the final moles?
Title: Re: concentration calculation
Post by: sjb on February 14, 2018, 06:47:59 AM
On the assumption that volumes are additive, your total volume is 3ml + a volume of 100 nM solution.