Method of determining conc. of NaOH Watch

printergirl
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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
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Hectors
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Is it from pH?
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printergirl
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(Original post by Hectors)
Is it from pH?
I dont know the answer, hence me asking
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Gaiaphage
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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.
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Gladiatorsword
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U put acid in arse

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printergirl
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(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
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charco
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(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
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Gaiaphage
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(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?
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charco
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(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.
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