can anyone help me with number 2? I\'ve attempted it but need help still, thanks

Question

can anyone help me with number 2? I've attempted it but need help still,
thanks!

SPcr Shies ur work - answers wishoun supporting woeh wit et vero worth a total or 4.s marks solution of fomic ucid in titrated with Nost util the sehution is 0.45ht n formle w and 0.ss t in sodium formate. Calculate Uhe pI value of shis wolation. O wark) Coruc n bes "Lian PK >.....6 SM r,4° ,A3"W- kOuLa, .ncoo" ! yM./Ka , 1.5 tt 39 In this experiment, you will make up a series of buffer solutions by mising Vcwcoo ml or o.soo M acetate and VcH COOH you will make up a series of buffer solutions by mixing Vcuycoc- ml. of 0.500 M acetic acid together. Show algebraically why this will always result in uilibrium concentrations in the buffer. where ICH3COO-] and [ CH3COOH ] are the eq (1.5 marks) Moleso heres isvolne e motes OAC ne les HOAc Vaa 9:

Explanation / Answer

2. making a buffer solution

[CH3COO-]/[CH3COOH]

when molarity of two solutions are the same = 0.500 M

say we added 10 ml CH3COO- and 30 ml CH3COOH solution

then,

[CH3COO-]/[CH3COOH] = [(0.500 M x 10 ml/40 ml)/(0.500 M x 30 ml/40 ml)]

removing the common terms,

[CH3COO-]/[CH3COOH] = (10 ml/30 ml)

So as can be seen when the initial molarity of the acid and conjugate base are the same, final volume are the same.

Then,

[CH3COO-]/[CH3COOH] = [V(CH3COO-)/(V(CH3COOH)]

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