[derek0o0]

Find the pH of a mixture of 100ml 0.5M Hcl and 200ml 0.1M HCl
how can i find it?

[nj_bartel]

find the moles of H⁺ released by both, find liters of solution.

[derek0o0]

find the moles of H⁺ released by both, find liters of solution.

is that mean 100/1000 x 0.5 and 200/1000 x 0.1 ?
then what?

[Borek]

Add and divide by final volume.

[derek0o0]

Add and divide by final volume.

can u explain more please

[Borek]

Add - to get total moles. Divide - to find concentration. Final volume - you have mixed two solutions of known volumes. No idea what to explain

[derek0o0]

Add - to get total moles. Divide - to find concentration. Final volume - you have mixed two solutions of known volumes. No idea what to explain

so is that mean
100/1000 x 0.5 + 200/1000 x 0.1
= 0.05 + 0.02
= 0.07

then 0.07 x 300/1000 = 0.021
so pH = -log0.021 = 1.68??

[Borek]

so is that mean
100/1000 x 0.5 + 200/1000 x 0.1
= 0.05 + 0.02
= 0.07

So far so good. 0.07 mole of HCl.

then 0.07 x 300/1000 = 0.021

Divide by the volume, not multiply.

[derek0o0]

so is that mean
100/1000 x 0.5 + 200/1000 x 0.1
= 0.05 + 0.02
= 0.07

So far so good. 0.07 mole of HCl.

then 0.07 x 300/1000 = 0.021

Divide by the volume, not multiply.

so is 0.07 x 1000/300 = 0.233
then pH = -log 0.2333 = 0.632 ?

or

0.07/300 = 0.000233
then pH = -log 0.000233 = 3.633 ?

which one is correct? thx so much for your help

[Borek]

Check your units and it will be obvious.

[derek0o0]

Check your units and it will be obvious.

so the pH is 3.633?

[Borek]

Show how you have checked the units.

[derek0o0]

Show how you have checked the units.

i don't understand lol
what u mean by check the unit
which unit

[Borek]

What units is your concetration expressed in?

[derek0o0]

What units is your concetration expressed in?

0.07mole in 300ml
V/1000 x M = mole = 300/1000 x M = 0.07
M = 0.07 x 1000/300 = 0.233
so pH = -log 0.233 = 0.632
correct?