[kenny32]

So I'm taking my first Chem class...I'm not a Chem major, but I'm still trying.

We're titrating NaOH (sodium hydroxide) into Kool Aid (to find the info about citric acid in the Kool Aid) and using phenolphthalein as an indicator, and I'm not really getting the calculations..

It took 46.98 mL of NaOH to set off the indicator for .37 grams of kool aid dissolved it water.

So, to get moles of NaOH added, do I use the molarity equation? If so, how do I get the moles of NaOH? Would it be the 46.98 multiplied by the molar mass of NaOH?

I also need to get the mass of the acid in the sample and the % acid in the sample...

Any help is appreciated.

[enahs]

When dealing with a solution (NaOH solution) it is quite helpful to know its concentration (Molarity, moles/L). Which nowhere did you provide.

[kenny32]

Looks like .1155 m/L

Thanks

[rabolisk]

Nevermind.

[kenny32]

About 25mL...The professor just told us to put in enough to make sure it dissolved...Didn't have to be exact.

[Borek]

http://www.titrations.info/titration-calculation

[kenny32]

Ok, so using molarity, I got 5.426x10^-3 moles...(.1155*.04698).

That seems correct...but I have no idea where to start to figure out the mass of the acid in the sample and % acid in the sample.

[rabolisk]

How do you convert from a mole of a substance to its mass?