HCl⟶H++Cl−
HI⟶H++I−
According to, the molarity of H+ is the same as HCl, because it is a strong acid and the mole ratio. So, I added the molarity of both acids: 0.15 M+0.055 M=0.205 M for H+ in solution.
pH= −log [H+]
pH= −log [0.205]
pH= 0.689
cHI(H+)=c(HI)cHCl(H+)=c(HCl)
Now you need to determine the amount of the protons in each solution with
n=c⋅V.
You have to add the amount of protons in each solution and determine the combined volume.
ntot(H+)=nHI(H+)+nHCl(H+)Vtot=V(HI)+V(HCl)
To calculate the pH of the resulting concentration, just take the negative logarithm.
pH=−logctot (H+) = −log[ntot (H+) Vtot]
pH is the negative logarithm of hydrogen ion concentration in a solution.
It determines the acidity and basicity of the solution.
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