Chemistry

posted by .

I did a back titration with an unknown carbonate and using the average % carbonate (by mass) which I found to be 27.40% and appropriate calculation decided where the unknown is an alkali metal carbonate or an alkaline earth metal carbonate. I have no idea how to tell the difference between to two using the percentage.

  • Chemistry -

    I think it would be Mg but I am still unsure as to what calculations to use

  • Chemistry -

    I'm not sure from your description exactly what you've done; however, one way you can check it is to calculate % carbonate in the few alkali and alkaline earth metal carbonates.
    Li2CO3 - = (60/73.9)*100 = 81.2
    Na2CO3= (60/106)* 100 = 56.6
    K2CO3 = (60/138.3)*100 = 43.4%
    MgCO3 is (60/84.3)*100 = 71.1
    CaCO3 = (60/100)^100 = 60%
    You aren't likely to have Rb2CO3 or Cs2CO3 but Rb2CO3 is (60/230.9)*100 = 26%
    MgCO3 isn't soluble in water. Was your sample soluble in water? How much confidence to you have in the 27.4.

  • Chemistry -

    It was in HCl, the 27.4% was obtained through the lab

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Chemistry

    Hello, we recently did a lab in our chemistry class to analyze an Unknown amount Calcium Carbonate which was titrated with EDTA. Our titration results were: mass of the unknown CaCO3 was 0.172 g and the mL of EDTA added was 30.7. How …
  2. chemistry

    How do you find the molecular weight of hydrogen carbonate and the atomic weight of the unknown metal in the hydrogen carbonate?
  3. science(chemistry)

    why sodium carbonate against hydrochloric acid titration using phenolphthalein indicator does not go to completion but stops at the sodium hydrogen carbonate stage.
  4. Chemistry

    Plan how you would make 100mL of a buffer solution with a pH of 10.80 to be made using only sodium carbonate, sodium hydrogen carbonate and water. You should specify the amount of sodium carbonate and sodium hydrogen carbonate that …
  5. Chemistry

    Suppose 2 grams of an unknown metal carbonate MCO3 is reacted with excess HCl and 0.88 grams of CO2 are produced. What is the atomic mass (molar mass) of the unknown metal M?
  6. Chemistry

    FB1 is a solution containing a mixture of potassium carbonate and sodium hydrogen carbonate . 25cm^3 of this mixture was to titrated against 0.250mol/dm^3 solution of HCL. In one titration using phenolphthalein as indicator, 10.00cm^3 …
  7. chemistry

    Explain why sodium carbonate against hydrochloric acid titration using phenophthalein titration do not go to completion but stop at the sodium hydrogen carbonate stage.
  8. Chem

    A tablet containing calcium carbonate and fillers with a mass of 1.631 g was dissolved in HCl. After the fillers were filtered out, the HCl was neutralized by adding sodium carbonate. The resulting precipitate was pure calcium carbonate …
  9. Chemistry

    A tablet containing calcium carbonate and fillers with a mass of 1.631 g was dissolved in HCl. After the fillers were filtered out, the HCl was neutralized by adding sodium carbonate. The resulting precipitate was pure calcium carbonate …
  10. Chemistry

    A tablet containing calcium carbonate and fillers with a mass of 1.631 g was dissolved in HCl. After the fillers were filtered out, the HCl was neutralized by adding sodium carbonate. The resulting precipitate was pure calcium carbonate …

More Similar Questions