1. Questions

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. 👍
  2. 👎
  3. 👁
Kizner

  1. yo what's the diference between phoenophyltlein and methyl orange in terms of titrating

    1. 👍
    2. 👎
    Anonymous

Respond to this Question

First Name

Your Response

Similar Questions

  1. chemistry

    A .523g sample of a mix of Na2co3 and Nahco3, is titrated with .1 HCl requiring 17 ml to reach the phenolphthalein end point and a total of 43.8 ml to reach the methyl orange end point. What is the percent of each of na2co3 and

  2. chemistry

    What is the equivalent weight of: (a) Potassium tetraoxalate, KHC2O4•H2C2O4•2H2O, if the complete neutralization is assumed. (b) Sodium carbonate if it is titrated to the phenolphthalein end point with HCl. The reaction is

  3. Chemistry

    1.) Watch the animation, and observe the titration process using a standard 0.100 M sodium hydroxide solution to titrate 50.0 mL of a 0.100 M hydrochloric acid solution. Identify which of the following statements regarding

  4. Chemistry

    Sorry DrBob, it's me again! Here's the info: Antacid Brand: Life Concentration of HCl: 0.1845 M Concentration of NaOH: 0.1482 M Trial 1: 1.Mass of Table: 1.2173g 2.Volume of HCl added: 75.0 mL 3.Milliomoles of HCl added:(0.1845M x

  1. College Chemistry

    The Question Is: "A student weighs 0.347 g of KHP on a laboratory balance. The KHP was titrated with NaOH and the concentration of the NaOH determined to be 0.110 M. For the second titration, the student correctly diluted 6 M HCl

  2. 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.

  3. CHEM-Le' Chatelier's Principle

    Use Le' Chatelier's Principle. this is a solution at equilibrium: 2CrO4^2-(aq)+ 2H^+(aq)< >Cr2O7^2-(aq) +H20 2CrO4^2- yellow Cr2O7^2- orange I just have to make predictions of the colour changes when: a)Add 0.3 M NaOH drop to 5

  4. Chemistry

    Why is phenolphthalein and methyl orange not used as indicator in dictator of calcium

  1. College Chemistry

    "A student weighs 0.347 g of KHP on a laboratory balance. The KHP was titrated with NaOH and the concentration of the NaOH determined to be 0.110 M. For the second titration, the student correctly diluted 6 M HCl from the reagent

  2. Chemistry

    The Question Is: "A student weighs 0.347 g of KHP on a laboratory balance. The KHP was titrated with NaOH and the concentration of the NaOH determined to be 0.110 M. For the second titration, the student correctly diluted 6 M HCl

  3. science

    Calculate the pH at 0, 10, 90, 100 & 110% titration for the titration of 50.0ml of 0.1M HCl with 0.10M NaOH?

  4. Chemisty

    The flask shown here contains 10.0 mL of HCl and a few drops of phenolphthalein indicator. The buret contains 0.270 M NaOH. What volume of NaOH is needed to reach the end point of the titration? What was the initial concentration

You can view more similar questions or ask a new question.