December 17, 2014

Homework Help: chemistry

Posted by fenerbahce on Sunday, July 15, 2012 at 7:53pm.

Run # Volume NaOH used (mL)
1 4.1
2 4.3
3 2.8

Concentraion of NaOH: 0.113 M

pH of acid: 2.84

the questions are:

#moles of NaOH: ?
initial acid concentration: ?
Determine the Ka and pka of the weak acid: ?

So here is what I did:

Shaked for several minutes about 1 g of the acid with 120 ml of distilled water. Filtered the solution into a clean beaker. Determined the concentration of the acid in the filtrate by pipetting a 25 ml aliquot into a clean flask and titrating it with 0.1 M sodium hydroxide.

Placed about 30 ml of the acid solution from part a in a 50 ml polystyrene breaker and found its ph using a ph meter.

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