# 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.

## 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