finding the concentration of hydrogen peroxide

[anabourdais]

I know that 5 vol H2O2 is equal to 0.44moldm-3.

 

in my experiment i used 5cm3 of 5vol. i then diluted this, using 4cm3 of 5 vol H2O2 and 1cm3 distilled H2O. How do i work out the concentration of this?

 

I have tried various methods and...(this may be stupid and very wrong but i wanted to show i'd tried!)

 

if 4 is 80% of 5 then can you find 80% of 0.44? - meaning 4cm3 H2O2 + 1cm3 H2O would have a concentration of 0.32 moldm-3..is this correct?

 

through this method i have worked out that:

 

3cm3 H2O2 + 2cm3 H2O = 0.264 moldm-3

2cm3 H2O2 + 3cm3 H2O = 0.176 moldm-3

1cm3 H2O2 + 4cm3 H2O = 0.08 moldm-3

0.5cm3 H2O2 + 4.5cm3 H2O = 0.044 moldm-3

 

Help greatly appreciated!

[thedarkshade]

I know that 5 vol H2O2 is equal to 0.44moldm-3.

 

in my experiment i used 5cm3 of 5vol. i then diluted this, using 4cm3 of 5 vol H2O2 and 1cm3 distilled H2O. How do i work out the concentration of this?

If you know the concentration in the first solution, then you can find out the second one by:

 

[math]c_1V_1=c_2V_2[/math]