Recent content by rss14

Thanks, "Yes. The difference will be in the equivalence point pH, " Can you just elaborate on that a bit further?

So regardless of whether the acid is a weak acid like acetic acid or a strong acid like HCl, it's just going to be a simple stoichiometric calculation?

Homework Statement After titrating 25mL 0.1M acetic acid with NaOH, determine the molarity of the NaOH. Equivalence point: 23.99mL NaOH added, pH = 8.37 Initial point: 0mL of NaOH added, pH = 3.07. Homework Equations ka = kw/kb kb = [CH3COOH][OH]/[CH3COO] The Attempt at...

Should it be expected that the parent photon will have a smaller wavelength than the two daughter photons?

When a photon, with the help of a nucleus experiences pair production to make a positron and an electron, the energy of the photon will equal the rest mass of both the electron and positron together right? Then when the electron and positron annihilate, the two photons produces will each have...

Nvm, ASA is a weak acid, and the equivalence point is at a pH of 8.2. Can someone please answer my other question though?

Another question: Phenolphthalein stays purple when the pH is between 8.2 and 12. When NaOH completely neutralizes ASA, the pH will be 7. This means an excess of NaOH (the base) had to be added until the solid purple appears. This is a source of error correct? A universal indicator should have...

So this same process can be done by chloroform and ether?

And another question. Can the methanol provide a source of error? Can a certain volume of NaOH dissolve into methanol instead of react with ASA to neutralize it? Will this lead to a higher reading of NaOH used to neutralize ASA?

From wiki "Phenolphthalein is insoluble in water, and is usually dissolved in alcohols for use in experiments. It is itself a weak acid, which can lose H+ ions in solution. The phenolphthalein molecule is colorless. However, the phenolphthalein ion is pink. When a base is added to the...

Phenolphthalein was used to indicate the moment the solution became basic. Phenolphthalein is soluble in methanol, but is it soluble in chloroform or ether?

Yeah, I know it's an acid. . . "The CTC handbook lists ASA to be soluble with alcohols, ethers and chlorofoam" If the solvent is not a problematic variable, then it has to be the titration substance (NaOH) For this particular lab, NaOH is the reason ethers and chlorofoams are not acceptable...

Homework Statement Why would methanol be a better solvent for ASA compared to ether or chloroform, when NaOH is used for titration? I think I have an idea why: NaOH is only soluble in polar solvents. Methanol is polar, while ether and chloroform are not. . . . Does this have anything to do...

Oh crap, I'm new here. I'm sorry. Edit: I'll give him hints now, so when he sees this thread, he can proceed right away. Wavelength depends on velocity and frequency. How would you find these values with the data given?

For wavelength, you need velocity and frequency. << complete solution deleted by berkeman >> I hope I did this right.