[iamash]

Hey all!

I have an assignment in which I've gotta standardize NaOH and HCl. The exact instructions are:
Objective:
A. Standardize ~ 0.125 M NaOH solution using solid potassium
biphthlate.
B. Standardize ~ 0.100 M HCl using your standardized NaOH.

Now, I'm not exactly sure as to how I should go about doing this. My teacher told me that she'd give us NaOH which was about 0.125M and it is our job to find the exact concentration by standardizing the NaOH. I'd appreciate it if anyone could help (i've attached the lab sheet)!

[Arkcon]

I don't know what to say, it is all there, just maybe not organized so you can see it.  But lets try:

You'll be given an HCl solution, approx. 0.100 M, what would you use to determine its concentration?  It should be about 0.100 M, but how do you accurately measure a gas -- HCl to dissolve it in water?

But you know that NaOH reacts with acids to neutralize them.  But how sure are you of it's concentration?  It says its 0.125, but NaOH reacts with CO₂ in the air.

The thing that may not be obvious at first, is that solid potassium biphthlate, that is exactly known -- or as good as your weighing of the dry pure solid can be.

So now that I've explained it backwards, can you figure it out stepwise forward?

[Borek]

http://www.titrations.info/ - everything you need (plus some). If you will browse the site you will even find exact procedures.