Question

The molar mass of an acid=40 . 50 ml of one normal ca(oh)2 is neutralized by 0.5g of acid . the basicity of the acid is ?

Answer 1

@Kryten

Answer 2

ill give it a go after i come back from store...

Answer 3

@Kryten r u there waiting for long...........

Answer 4

hey it says it is neutralized so pH = 7 = pOH= 7

Answer 5

ok

Answer 6

but the answer is 4@kryten

Answer 7

@Kryten

Answer 8

then it isnt neutralized solution!!!

Answer 9

ok lets try it like this:
1 N Ca(OH)2 = 0,5 M CaOH
then n(Ca(OH)2)= 0,5M * 50*10^-3dm3= 0,025 mol
n(acid)= 0,5 g/ 40 gmol-1 = 0,0125 mol
now we dont know which acid it is so we dont know ratio between them so im stuck

Answer 10

Basicity is 4. 0.125 moles of acid can neutralize .025 moles. So 1 mole of acid is neutralizing 2 moles of Ca(OH)2. There are 2 OHs in Ca(OH)2. If each mole of acid had 2 H, then 1 mole of acid would neutralize 1 mole of Ca(OH)2. But you only need half the number of moles of acid. So you must have 4 H in each mole of acid.

Answer 11

Hi @Preetha!
I think @Kryten and myself have never heard of that concept: "basicity of an acid".
It is probably not taught as such in our countries, and the name does not speak for itself!

I am not sure I could understand it from your solution.
Could you give us the definition, please ?

Answer 12

@Preetha: please, do also tell us if this quantity has a unit or not!

Answer 13

http://www.chem.ucalgary.ca/courses/350/Carey5th/Ch01/ch1-8.html

Answer 14

I count the number of H atoms.

Answer 15

Its an old fashioned term and like the term normality, not in use.

Answer 16

The link points to the concept I know.

Do you mean "basicity of an acid" is the amount of OH- one mole of this acid can neutralize?
So it is always an integer?

Answer 17

y

Answer 18

Thanks.
Here we simply say:
mon(o)acid, diacid, triacid... polyacid... etc.
monobase, dibase...

Answer 19

Thanks Preetha for clearing it out cause Vincent was right we use mono, di, tri, poli...