What is the relationship between pKa pKb and pKw for a conjugate acid base pair?
What is the relationship between pKa pKb and pKw for a conjugate acid base pair?
If we take (–log) of both sides, we will get: pKa + pKb = pKw =14 Page 3 A very important conclusion can be drawn from the above equation. If pKa of an acid is lower then its conjugate base must have higher pKb and vise versa, which means strong acid has a weak conjugate base.
What is the relationship of pKa and Ka?
Similar to pH, the value of Ka can also be represented as pKa. pKa = -log Ka. The larger the pKa, the weaker the acid.
What is the relationship of KA and KB?
The Ka is the acid dissociation constant. The larger the value of Kb, the stronger the base, and the larger the value of Ka, the stronger the acid. By multiplying Ka by Kb, you receive the Kw, or the dissociation constant for water, which is 1.0 x 10^-14.
What is the difference between KW and pKw?
Kw is the autoprolysis constant of water at 25 degrees Celsius and is always equal to 1.0 x 10^-14. pKw is the -log(Kw) as p is shorthand for -log.
What is pKa and pKb in chemistry?
pKa and pKb are used to compare the strength of acids and bases respectively. pKa is given for acid dissociations. pKb is given for dissociation of bases. The difference between pKa and pKb is that pKa is the negative logarithm of Ka whereas pKb is the negative logarithm of Kb.
What is pKw in chemistry?
pKw = pH + pOH. As [H3O+] equals [OH-], then pH must equal pOH because these are just the negative logs of the respective concentrations, which are equal. Therefore, the equation becomes pKw = pH + pH = 2 x pH.
What is the relationship between KB and pKb?
A large Kb value indicates the high level of dissociation of a strong base. A lower pKb value indicates a stronger base.
What is pKw?
pKw = pH + pOH. As [H3O+] equals [OH-], then pH must equal pOH because these are just the negative logs of the respective concentrations, which are equal. Therefore, the equation becomes pKw = pH + pH = 2 x pH. Therefore, pH = pKw/2.
What is kb and pKb?
Kb is the base dissociation constant. The base dissociation constant is a measure of how completely a base dissociates into its component ions in water. pKb is the negative base-10 logarithm of the base dissociation constant (Kb) of a solution. It is used to determine the strength of a base or alkaline solution.
What is the relationship between pKa and PKB?
A large Kb value indicates the high level of dissociation of a strong base. A lower pKb value indicates a stronger base. pKa and pKb are related by the simple relation: pKa + pKb = 14
What is the difference between Ka and PKA in chemistry?
Ka and pKa relate to acids, while Kb and pKb deal with bases. Like pH and pOH, these values also account for hydrogen ion or proton concentration (for Ka and pKa) or hydroxide ion concentration (for Kb and pKb).
What is the base dissociation constant pKb?
Kb is the base dissociation constant. The base dissociation constant is a measure of how completely a base dissociates into its component ions in water. Kb = [B+] [OH-]/ [BOH] pKb = -log Kb
What is the effect of PKA on conjugate base strength?
A strong acid (low pKa) will have a weak conjugate base (high pKb), and a weak acid (high pKa) will have a comparatively strong conjugate base (low pKb). The lower the pKa of the acid, the higher the pKb of its conjugate base.
