Phenolphtalein vs Methyl Orange (check my reasonin

Why can either phenolphthalein or methyl orange be used for an HCl-NaOH titration, but only phnolphthalein is suitable for an acetic acid-NaOH titration?

Sol: for a while,I misunderstood the question and suggested that Phenol. has a wider array of pH. But then both can be used for and HCl-NaOH. I can't see any other reason but to compare the solution changes (-1<pKa>+1.

P.S. I found that the pH of methyl orange ranges from 3.1 - 4.4 pH whereas, phenol. is 8.2 - 10. I know that in acidic solution, Phenol is colorless, so I imagine phenolphthalein is more appropriate for HCl-NaOH titration because it will change color. It's perfect for this type of titration??



Your reasoning is incorrect. Did you not see the post in which I answered this question. It is the one involving how to draw a graph to show the points on the titration curve for acetic acid vs NaOH and HCl vs NaOH and where the indicators change in relation to the end point for each titration. I can't find it now but look through your notes. It may have been another student but I think you were the one. If you can find it then tell me what you don't understand about my instructions for drawing the graph and perhaps we can get through another one together. By the way, phenolphthalein changes from approximately 8.3 to approximately 10 or about 9 as a mid-point. The equivalence point for HCl vs NaOH is 7.0 and the equivalence point for acetic acid vs NaOH is close to 9. The range for methyl orange you found is ok.

  1. πŸ‘ 0
  2. πŸ‘Ž 0
  3. πŸ‘ 91
asked by Kizner
  1. yo what's the diference between phoenophyltlein and methyl orange in terms of titrating

    1. πŸ‘ 0
    2. πŸ‘Ž 0
    posted by Anonymous

Respond to this Question

First Name

Your Response

Similar Questions

  1. science, chemistry

    OBJECTIVE: to find out which of two indicators, methyl orange or phenolphthalein, gives more reliable and consistent results in the titration of H3PO4 with NaOH. REQUIREMENT: (1). Phosphoric acid solution of unknown concentration.

    asked by elijah on November 5, 2014
  2. science

    OBJECTIVE: to find out which of two indicators, methyl orange or phenolphthalein, gives more reliable and consistent results in the titration of H3PO4 with NaOH. REQUIREMENT: (1). Phosphoric acid solution of unknown concentration.

    asked by somiah on October 28, 2013
  3. Chemistry

    For the titration of hcl versus NaOh, suggest a better indicator than methyl orange. Why is methyl orange not the ideal choice for this application?

    asked by Hol on November 1, 2013
  4. ghemistry

    which indicator is more reliable in the titration of H3PO4 with NaOH using methyl orange and phenolphthalein as indicators

    asked by gina on September 26, 2010
  5. Science

    which of these two methyl orange and phenolphthalein gives more reliable and consistent results in the titration of H3PO4 with NaOH

    asked by Ro on October 26, 2011
  6. Chemistry -help

    To determine the sodium carbonate content & total alkali in NaOH, the following steps were performed:- 1) 2.0g of NaOH was dissolved in 80ml of CO2 free water. 2) 3 drops of phenolphthalein indicator were added and the solution

    asked by anne on September 18, 2010
  7. Chemistry Lab

    What is a "common-ion effect", and how does it affect the molar solubility of a salt? Why can either phenolphtalein or methyl orange be used for an HCl-NaOH titration, but only phenophtalein is suitable for an acetic acid-NaOH

    asked by Anonymous on June 11, 2006
  8. alkali mixtur titration

    why phenolphthalein is added first then methyl orange in alkali mixtur titration

    asked by jiya on October 8, 2014
  9. dijla

    if you change the indicator of standardization Hcl with Na2co3 methyl red methyl orange titration corset not why?

    asked by yasser on December 5, 2012
  10. chemistry

    Hello. In the class, we did the experiment to calculate the value of Kc for the following reaction: CH3COOH+CH3CH2OH ÌCH3COOCH2CH3+H2O we measured the mass for 5 cm^3 of all 5 compound above: CH3COOH 5.236 g CH3CH2OH 4.021 g

    asked by masaya on November 1, 2008

More Similar Questions