For the weak hypochlorous acid (HClO), which statement is true at the point halfway to the equivalence point?
A. The total amount of HClO is equal to the pKa.
B. The total amount of HClO is equal to ClO-.
C. The total amount of H3O+ is equal to the amount of OH- .
D. The total amount of ClO- is equal to the Ka of the acid.
I feel like the answer is A but I'm not sure
The answer is:
B. The total amount of HClO is equal to ClO-
Is the answer B then??
B since [HClO]/[ClO-]=1 for ph=pka to be true by henderson hasselbach
Cmon Bob. smh
Bob just go away
To determine which statement is true at the point halfway to the equivalence point for weak hypochlorous acid (HClO), let's break down each option and analyze them one by one:
A. The total amount of HClO is equal to the pKa.
B. The total amount of HClO is equal to ClO-.
C. The total amount of H3O+ is equal to the amount of OH-.
D. The total amount of ClO- is equal to the Ka of the acid.
Option A states that the total amount of HClO is equal to the pKa. However, at the point halfway to the equivalence point, the ratio of the concentrations of HClO and ClO- is 1:1. This means that only half of the HClO has dissociated into ClO-. Therefore, option A is not correct.
Option B suggests that the total amount of HClO is equal to ClO-. At the halfway point, the concentrations of HClO and ClO- are equal due to their 1:1 ratio. As a result, option B is correct.
Option C states that the total amount of H3O+ is equal to the amount of OH-. However, the pH halfway to the equivalence point for weak acids is weakly acidic (pH < 7). This means that the concentration of H3O+ is higher than the concentration of OH-. Therefore, option C is not correct.
Option D implies that the total amount of ClO- is equal to the Ka of the acid. However, the Ka value is a measure of the acid's strength, not the concentration of ClO-. Therefore, option D is not correct.
In conclusion, option B is the correct answer. At the halfway point to the equivalence point for a weak acid like HClO, the total amount of HClO is equal to ClO-.
Suppose you have 100 millimols HClO and you titrate it with NaOH. So halfway to the equivalence point you will have added 50 millimols NaOH.
.........HClO + NaOH ==> NaClO + H2O
I........100.....0..........0......0
add ............50..................
C........-50...-50.........50.....50
E........50......0.........50......50
Does this tell you?