science_geeks
Badges: 15
Rep:
?
#1
Report Thread starter 4 weeks ago
#1
Hi I really struggle with serial dilutions, please could someone help me with this question?

How much distilled water should be added to a 5ml stock solution to make a 25 X dilution?

** update - I've had another go and I've worked out 4.8 ml.. **
Last edited by science_geeks; 4 weeks ago
0
reply
charco
Badges: 17
Rep:
?
#2
Report 4 weeks ago
#2
(Original post by science_geeks)
Hi I really struggle with serial dilutions, please could someone help me with this question?

How much distilled water should be added to a 5ml stock solution to make a 25 X dilution?

** update - I've had another go and I've worked out 4.8 ml.. **
If it's a 25x deilution you must end up with the same moles in 25 x more volume.

So you add 24 times the initial volume, so the total volume is 25x the original volume.
0
reply
Pigster
Badges: 19
Rep:
?
#3
Report 4 weeks ago
#3
(Original post by science_geeks)
Hi I really struggle with serial dilutions, please could someone help me with this question?

How much distilled water should be added to a 5ml stock solution to make a 25 X dilution?

** update - I've had another go and I've worked out 4.8 ml.. **
Given that charco answered your Q about five hours before you posted your incorrect update, then I'd be worried, if I were you.

You worked out how much water you'd need to make 5 ml of a 25x dilution of your stock, rather than "to add to [the] stock solution".
0
reply
science_geeks
Badges: 15
Rep:
?
#4
Report Thread starter 4 weeks ago
#4
(Original post by charco)
If it's a 25x deilution you must end up with the same moles in 25 x more volume.

So you add 24 times the initial volume, so the total volume is 25x the original volume.
Thank you for your help! That makes sense
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

Current uni students - are you thinking of dropping out of university?

Yes, I'm seriously considering dropping out (183)
14.3%
I'm not sure (59)
4.61%
No, I'm going to stick it out for now (376)
29.38%
I have already dropped out (37)
2.89%
I'm not a current university student (625)
48.83%

Watched Threads

View All