The Volume of NaOH is mathematically given as
V=3.2 L
Generally the formula for PH is
Ph= Pka + log[A^-]/[HA]
4.93 = 4.76 + log((40+X)/(60-X))
0.17 = log ((40+X)/(60-X))
Therefore
X= 19.66 mmol = 0.019 mol
Generally the formula for molarity is
M= number of moles / volume
6 = 0.019 / V
V=3.2 L
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