How do you calculate the percent dissociation of a weak acid?
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How do you calculate the percent dissociation of a weak acid?
Sample Dissociation Calculation A weak acid, HA, has a pKa of 4.756. If the solution pH is 3.85, what percentage of the acid is dissociated? Percent dissociation is therefore given by 1.413 x 10-4 ÷ 0.0011375 = 0.1242 = 12.42\%.
What is the Ka expression for HOCl?
The value of Ka for hypochlorous acid (HOCl) is 2.8 x 10-8.
Which of the following is true about a 0.10 M solution of a weak acid HX?
Which of the following is true about a 0.10 M solution of a weak acid, HX? since it is weak acid so it won’t dissociate completely. so concentration of HX will be more than H+ and X-. pH is not equal to 1.
How do you solve dissociation?
– There is a way to calculate the percentage of dissociation of a compound, we have to divide the mass of the dissociated ions with total mass of the dissociated and not dissociated compound and multiply with 100 to get in percentage.
What is the percentage dissociation of 0.1 m?
(D) 0.01\% Hint: Any acid dissociates into ions according to the dissociation constant of that acid. Not all the acid molecules are dissociated in the solution. We can calculate the \% dissociation by knowing the concentration of both acetic acid and its ions in the solution.
How does HOCl dissociate?
In aqueous solution, hypochlorous acid partially dissociates into the anion hypochlorite ClO−: HOCl ⇌ ClO− + H. Salts of hypochlorous acid are called hypochlorites. One of the best-known hypochlorites is NaClO, the active ingredient in bleach.
What is the equilibrium constant expression Ka for the acid dissociation of hypochlorous acid?
The equilibrium constant for this expression is called the acid dissociation constant, Ka….
| Weak Acid | Equation | Ka |
|---|---|---|
| hypochlorous acid | HOCl H+ + OCl- | 3.5 × 10-8 |
| hypoiodous acid | HOI H+ + OI- | 2 × 10-11 |
| lactic acid | CH3CH(OH)CO2H H+ + CH3CH(OH)CO2- | 1.38 × 10-4 |
| nitrous acid | HNO2 H+ + NO2- | 4.0 × 10-4 |
Which of the following responses is true with regard to a 0.1 M solution of a weak acid HA?
1 Expert Answer pH > 1 would be true for a 0.1M solution of a weak acid.
What is the percent dissociation?
Percent dissociation is symbolized as α (alpha) and represents the ratio of the concentration of dissociated hydrogen ion [H+] to the concentration of the undissociated species [HA]. Unlike Ka, percent dissociation varies with the concentration of HA; dilute acids dissociate more than concentrated ones.