chem

posted by .

if a 240mg of an acid H2A required 50.0ml of 0.10M NaOH for complete neutralization, what is yhe equivalent weight of the acid? what is its molecular weight?

  • chem -

    0.1M NaOH = 0.1N NaOH
    H2A + 2NaOH ==> Na2A + 2H2O

    When the problem says "complete" neutralization, that mans BOTH H atoms have been replaced.
    mL x N x m.e.w = grams.
    50.00 x 0.1N x m.e.w. = 0.240g
    solve for m.e.w = milliequivalent weight.
    Multply by 1000 to convert to equivalent weight.
    Then equivalent weight = molecular weight/replaceable Hs.
    You know equivalent weight and replaceable H atoms (2), solve for molecular weight.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Chemistry

    If the unknown tri protic acid has an equivalent weight of 46.79 g/equiv, its average molecular weight is ?
  2. chem-acid base titrations

    If 20.0mL of .2019M HCI requires 39.63mL of a NaOH solution for complete neutralization, what is the concentration of the NaOH solution?
  3. Chemistry

    I there, this is my lab worksheet, I am having trouble filling it out. Please help me with it. Expt #1- Molecular Weight of Unknown Acid Unknown Acid: #3 Mass of Unknown solid acid transferred:1.0g Volume of volumetric flask: 100.00 …
  4. Chemistry

    Expt #1- Molecular Weight of Unknown Acid Unknown Acid: #2 Mass of Unknown solid acid transferred:0.414g Volume of volumetric flask: 100.00 mL Concentration of NaOH: 0.0989 M Aliqot of acid titrated with NaOH: 25.00 mL Average volume …
  5. chem

    I'm suppose to calculate the weight percent per volume (grams pre 100cm3) of ethanoic acid in a commercial sample of vineger from the following: (a) 0.4321g of pure momoprotic acid( formula weight 204.2 amu) required 23.45cm3 of naoh …
  6. Chemistry

    Lab: Titration of NaOH (0.1 molar)to unknown solid acid. Trying to determine the equilivent weight of the unknown acid in the experiement. I am trying to figure out if I add too much base solution by accident to an unknown acid during …
  7. Chemistry

    If 20mL of a 0.100 M NaOH solution are required to titrate 0.25 grams of an unknown acid, what is the equivalent mass of the acid?
  8. chemistry - (Dr. Bob222)

    A student attempted to synthesize malonic acid which has a molecular weight of 104 g/mol by the same method used to synthesize aspirin. A titration was performed to find the equivalent weight. 0.125 g of malonic acid product was used …
  9. Chemistry

    If 14.23 mL of 0.203 M NaOH is required to neutralize .269 g of a monoprotic unknown acid, what is the molecular weight of the unknown acid?
  10. chem

    I titrated a 250mg tablet to see if it really had 250mg of scorbutic acid (H2C6O6) a diuretic acid, in it. I took a 250mg tablet, grounded it up and found it took 35.87ml of .0505 M NaOH to neutralize it 1. How many moles of NaOH is …

More Similar Questions