[dave666]

ok so hears the question:

you are provided with an aqueous solution of sodium hydroxide, with an approximate concentration of 2 mol dm^-3

you are required to plan two different experiments to determine, as accurately as possible, the concentration of the solution of sodium hydroxide

both methods should involve chemical reactions and only one method should involve a titration.

what could be the other method?

[sjb]

You may find some ideas at http://www.chemicalforums.com/index.php?topic=25339.0 and related threads.

[Arkcon]

You can start with the previous discussion on the exact same topic:

http://www.chemicalforums.com/index.php?topic=25339.msg95776#msg95776

*[EDIT]*

Awww, sjb:, you're too fast for me.

Anyway, Dave of the Beast, can you list for us some chemical reactions you know that NaOH undergoes?  Acid-base titration would be one,  can you name some others, and how to quantify reactants or products?

[dave666]

To be honest I have no idea what a Gravimetric analysis is. I was thinking more a reaction with iron(III) chloride which would form a precipitate with the hydroxide ions which could be filtered off and weighed?

[Arkcon]

Like I gave as a final hint in that thread, whenever you weigh something analytically, that's gravimetric (see the root words -- gravi and metric) analysis.  Iron Hydroxide?  A good choice.  I was considering also a reaction with zinc or aluminum, and measuring the hydrogen volume produced.  Not that I'd want to actually do that one mind you, too many other variables.  But while we're on the subject, might as well shoot the moon.

[dave666]

id love to shoot the moon or the sun, but this is the ocr planning question for A2, its not for fun

[Arkcon]

id love to shoot the moon or the sun, but this is the ocr planning question for A2, its not for fun

Granted, but they don't actually want you to perform the experiments, so why not, simply, go mad?  It's a nice day for it.

[dave666]

it would make for a better question 'how to shoot the moon'. and you would get more people doin chemistry