posted by .

I had a 1.094g of mystery Alum. "AB(SO4)c. dH2O" (I assume that that the Alum is KAl(SO4)2-12H2O but we don't know A B c or d, we do know that mass percent of water is 51.9)

After processing the alum (Ba(NO3)2 and HNO3 through a gooch crucible) we end up with 1.739g of BaSO4.

We know that SO4 is 42.15% of BASO4 thus
SO4 has a mass of .7330 g

assuming we captured all of the SO4 of the original Alum.
so if we subtract .7330g from 1.094g = .361 g

therefor .361g is the the AB and the H2O of the Alum

but if water is 51 of the mass of the Alum. I did something wrong any ideas.

  • Chemistry -

    You're right. Something is wrong but it must have been in the experimental details. Your math is not quite right but it won't make that much difference.
    I think the 42.15% SO4 in BaSO4 is not quite right. I think that should be (96/233.39)*100 = 41.13%. That won't make that much difference. Mass SO4 = 1.739 x (96/233.39) = 0.7153g
    I don't think the H2O calculation is correct either. 1.094 x 0.519 = 0.5678 and 1.094-0.5678 = 0.5262g for AB(SO4)c.
    So you are faced with the situation of sulfate weighing more than the anhydrous salt.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Chemistry

    is KAl(SO4)2 12H2O hygroscopic, deliquescent, or efflorescent?
  2. ap chemistry

    The formula for epsom salt is MgSO4 . 7H20 If 1.250 g of the compound is dissolved in water, calculate the number of milliliters of .200 M Ba(NO3)2 that would be required to precipitate all of the sulfate ions as barium sulfate. Do …
  3. Chemistry Intro

    If the solubility of alum is 1g @ 1 degree celcius and 1.7 g at 6 degree celcius how much alum (KAl(SO4)2.12H20) would you expect to dissolve at 5.5% C?
  4. College Chemistry I

    A method for recycling scrap aluminum converts it to alum [potassium aluminum sulfate dodecahydrate, KAl(SO4)2·12H2O]. What is the maximum amount of alum (in metric tons) that can be prepared from 3.12 metric tons of scrap aluminum …
  5. University Chemistry (first year)

    I'm working on a first year chemistry lab where we synthesized alum from alunimini foil and I'm doing the report and one of the questions is as follows: Based on your findings, what volume of water can be cleared of suspended solids …
  6. Chemistry

    How many moles and how many grams of potassium alum, KAl(SO4)2 · 12 H2O, can be prepared from 5.00 g of aluminum?
  7. Chemistry

    How would I find the percent of water lost in alum after it has dried for a week?
  8. Chemistry

    Why is my actual percent of sulfate in alum a lot less than my theoretical percent of sulfate in alum?
  9. chemistry

    Determine the limiting reactant for this reaction if 3.027 grams of Aluminum are reacted with 60.00 mL of a solution that is 6 M KOH. Determine the amount of KAl(SO4)2•12 H2O that can be produced from this reaction. Molar mass Alum …
  10. Chemistry lab

    1)Why is it necessary to heat the alum until its mass does not change by more than 2mg?

More Similar Questions