AP CHEMISTRY

posted by .

Phenolphthalein would not be an appropriate indicator to use to determine the Ka1 of phosphoric acid Why not? what indicator would be appropriate?

I Think its 8-11 as it is a small range but i'don't know if its right.

  • AP CHEMISTRY -

    The pH range for phenolphthalein is 8-10 so it would not be appropriate for H3PO4 since the equivalence point is much more acid than that. If you know the pH range for K1 for H3PO4, here is a link from which you can pick the right indicator to use.
    http://www.jiskha.com/display.cgi?id=1329337234

  • AP CHEMISTRY -

    Thanx!!

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Chemistry

    If you have two solutions, one of pH 7 and one of pH 9, but they are not labeled, which indicator would be used to identify the two, methyl orange or phenolphthalein?
  2. Chemistry

    Phenolphthalein is an indicator that changes colour to pink/purple between pH 8-->10, however, neutralization occurs when pH=7. Why can phenolphthalein still be used as the indicator during a strong acid-strong base titration with …
  3. chemistry

    If this "point" for a particular titration occurs at pH x, a good indicator for for the titration would be indicator. Note: Provide only 1 indicator name (even if there are other indicators possible) and make sure the spelling is correct. …
  4. Chemistry--titrations

    What characteristic of phenolphthalein makes it appropriate to use in a HCl/NaOH titration?
  5. chemistry

    what are the errors in the double-indicator titration of (sodium carbonate and sodium hydrogen carbonate) against hydrochloric acid, using Phenolphthalein and Methyl orange as indicator?
  6. Chemistry

    The indicator bromocresol green (HIn) can be in two different forms: As HIn the color of the indicator is yellow, an In the color of the indicator is blue, and an equilmolar mixture of the two species is green. The Ka of the indicator …
  7. chemistry

    When sulphur dioxide is dissolved in water and a drop of Universal Indicator was added the indicator, what colour would the indicator turn ?
  8. chemistry

    why we use phenolphthalein indicator in the determination of the strenght of NAOH by using standard oxalic acid why not the others indicator?
  9. Chemistry

    How do can you find the difference between these acids/bases with only one indicator?
  10. Chemistry

    Conclusions about the best indicator to use- Consider the pKa of indicator in relation to equivalence point of reaction, ease of seeing the endpoint color change, precision of measurements,etc. Which indicator would you choose if planning …

More Similar Questions