chemistry

posted by .

We did an experiment on Quantitative Analysis of Soda ash by Double-Indicator Titration.

What is the cause of carbonate error and its effect on the calculated values obtained in standardizatin and sample analysis?

  • chemistry -

    Actually you have several questions rolled into one. The simplest answer is that CO2 is absorbed by the NaOH and that decreases the molarity of the standard base. IF the indicator is one that changes in the acid region (for example, bromocresol green or methyl red) then no error is created because two Hs have been used up in the reaction with CO2 and both hydrogens have been titrated with the indicator.
    CO2 + 2H^+ ==> H2CO3.
    However, if you are doing a double indicator titration, then one of the indicators is in the basic region (such as phenolphthalein) and only one of the hydrogens is titrated and that is the cause of the carbonate error.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Chemistry

    1. Why cannot NaOH be used as primary standard for HCl?
  2. Chemistry

    What could be the effects of carbonate error on the calculated values for the standardization and the sample analysis?
  3. chem

    Quantitative analysis of soda ash by double indicator *why there is a need to boil distilled water in the preparation of base solutions?
  4. chem

    quantitative determination of acetylsalicylic acid in aspirin tablets by back titration 1)why do we use a more dilute NaOH solution for the standardization of NaOH?
  5. chemistry

    We had an experiment in class: Soda Ash Titration using Double Indicator Method How would you know the composition of the sample based on the comparison volume of titrant (HCl) used?
  6. Inorganic Quantitative Analysis

    What is a double indicator titration?
  7. Chemistry

    Experiment 10: Which Fuels provide the most heat?
  8. 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?
  9. 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?
  10. Chemistry

    I titrated 0.25g of soda ash mixed with 25mL of deionized water and it took 43.7mL of hydrochloric acid to complete the titration. I am trying to figure out how to find the moles of sodium carbonate in the soda ash and then the percent …

More Similar Questions