# Method of determining conc. of NaOHWatch

#1
I am stuck in trying to find out what is the primary standard of finding the concentration of NaOH. The only way i can think of is titration but this isnt the answer
0
4 years ago
#2
Is it from pH?
0
#3
(Original post by Hectors)
Is it from pH?
0
4 years ago
#4
We need more context. If you neutralised an known-conc acid using a given volume of NaOH, you can work it out fairly easily by using equation ratios. If you reacted sodium with water, you can work it out using n = m/M then c = n/v. If you have the pH of the solution, you can work out pOH (if given Kw, or may assume it's 1x10^-14), then do [OH-] = 1x10^-pOH.
0
4 years ago
#5
U put acid in arse

Posted from TSR Mobile
0
#6
(Original post by Gaiaphage)
We need more context. If you neutralised an known-conc acid using a given volume of NaOH, you can work it out fairly easily by using equation ratios. If you reacted sodium with water, you can work it out using n = m/M then c = n/v. If you have the pH of the solution, you can work out pOH (if given Kw, or may assume it's 1x10^-14), then do [OH-] = 1x10^-pOH.
i have been asked what is the most convient primary standard for determning the conc of sodium hydroxide and why its used
0
4 years ago
#7
(Original post by printergirl)
i have been asked what is the most convient primary standard for determning the conc of sodium hydroxide and why its used
It is most likely potassium hydrogenphthalate ...

It is a primary standard, meaning ...

It is available in a very pure form
It is stable in the environment
It has a high relative mass
It reacts as an acid
It is soluble
0
4 years ago
#8
(Original post by charco)
It is most likely potassium hydrogenphthalate ...
I may be wrong because I've only done A2 Chem so haven't heard of this, but surely a pH meter is easier, quicker and cheaper?
0
4 years ago
#9
(Original post by Gaiaphage)
I may be wrong because I've only done A2 Chem so haven't heard of this, but surely a pH meter is easier, quicker and cheaper?
pH meters are inaccurate and unreliable at high or low pH values.
0
X

new posts
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

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

### University open days

• Cranfield University
Cranfield Forensic MSc Programme Open Day Postgraduate
Thu, 25 Apr '19
• University of the Arts London
Open day: MA Footwear and MA Fashion Artefact Postgraduate
Thu, 25 Apr '19
• Cardiff Metropolitan University
Sat, 27 Apr '19

### Poll

Join the discussion

#### Have you registered to vote?

Yes! (264)
38.94%
No - but I will (46)
6.78%
No - I don't want to (51)
7.52%
No - I can't vote (<18, not in UK, etc) (317)
46.76%