What is the formula for titration? (1 Viewer)

[abdog]

Is it "C1V1=C2V2" or "C=n/v"?

 

[abdog]

I've seen C1V1=C2V2 before as well, do you know when to use it?

 

[wannabesurgeon]

C1V1 = C2V2 is used to find either the volume or concentration of a solution that's already prepared to a known concentration, and dliute them to new concentration/volume as needed. Which is Titration I think?

eg. If 25.00 mol of a solution of concentration 0.3750mol/L was diluted to a new volume of 500.0mL, what is the concentration of the diluted solution?

C1V1 = C2V2

C1 = 0.3750mol/L
V1=25mL
C2 = ?
V2 = 500.0mL

So.. C2 = C1V1/V2

C2 = 0.375 x 0.025 / 0.5

C2= 0.01875 mol/L



C = n/v is a way of measuring the concentration of a solution (Molarity)

eg. Calculate the Molarity of a solution that has 0.4 moles of solute dissolved in 400mL of solutuion

C =?
n =0.4mol
V = 400mL = 0.4L

C = 0.4/0.4
C= 1 mol/L or 1M

Hope that helps

 

[abdog]

can't we use C=n/v for both of them? C=n/v can be used once the chemical formula is written out, right?

 

[Aysce]

can't we use C=n/v for both of them? C=n/v can be used once the chemical formula is written out, right?

I tested with C=n/v and it also works.

I just got a different answer since wannabesurgeon plugged in the wrong values ie. C1 = 0.3250 not 0.3750

 

[wannabesurgeon]

I tested with C=n/v and it also works.

I just got a different answer since wannabesurgeon plugged in the wrong values ie. C1 = 0.3250 not 0.3750

My bad, Fixed.

 

[abdog]

So what's the point of C1V1=C2V2? I don't get it.... Is there a special situation where we have to use it?

 

[Aysce]

So what's the point of C1V1=C2V2? I don't get it.... Is there a special situation where we have to use it?

It depends on the question - sometimes it's easier to use C1V1 = C2V2 rather than c = n/V. It just makes life easier imo but do whatever suits you.

 

[madharris]

So what's the point of C1V1=C2V2? I don't get it.... Is there a special situation where we have to use it?

C1V1=C2V2 is only when the molar ratio is 1:1 e.g HCl + NaOH --> NaCl + H2O (the molar ratio is 1:1)

You would use n=cv when the molar ratio is not 1:1

alternatively you can use: (CaVa)/a = (CbVb)/b
where Ca, Cb = Concentrations
Va, Vb = volumes
a, a = coefficient