Diprotic acids ionization constant

The first acid ionization constant of the oxoacid H3PO2 is 8 X 10 . What molecular structure do you predict for H3PO2 Will this acid be monoprotic, diprotic, or triprotic in aqueous solution ... 

What are diprotic and triprotic acids List an example of each. Define the acid ionization constant and explain its significance. Write an equation for the autoionization of water and an expression for the ion product constant for water (Ky,). What is the value of a at 25 °C ... 

A 20.0 mL sample of a 0.125 M diprotic acid (H2A) solution is titrated with 0.1019 M KOH. The acid ionization constants for the acid are = 5.2 X 10 and = 3.4 X 10 At what added volume of base does each equivalence point occur ... 

Certain weak acids are polyprotic they contain more than one ionizable hydrogen atom. Such acids ionize in steps, with a separate equilibrium constant for each step. Oxalic acid, a weak organic acid sometimes used to remove bloodstains, is diprotic ... 

Statistical Effects. In a symmetrical diprotic acid, the first dissociation constant is twice as large as expected since there are two equivalent ionizable... 

A For an aqueous solution of a diprotic acid, the concentration of the divalent anion equals the second ionization constant ["OOCCH2COO" J = = 2.0x1 O 6 M. We organize... 

Statistical effects. In a symmetrical diprotic acid, the first dissociation constant is twice as large as expected since there are two equivalent ionizable hydrogens, while the second constant is only half as large as expected because the conjugate base can accept a proton at two equivalent sites. So K IKi should be 4, and approximately this value is found... 

Uses of ionization constants to compute concentrations of the ions present in solution and the pH of the solution are illustrated in the following problems. First we consider the dissociation of a monoprotic acid, using acetic acid as an example. Later we examine the dissociation of a diprotic acid, H2S, in connection with precipitation of metal sulfides. 

Following the approach of Tanford (1961), it is useful to examine the ionization of a hypothetical diprotic acid (HA-BH). Thermodynamically, the acid-base properties of this acid are completely described by two acid dissociation constants ( fi and K2). However, at the molecular level, it is clearly more appropriate to define four dissociation constants as depicted in Equation (2) ... 

The treatment of diprotic and polyprotic acids is more involved than that of mono-protic acids because these substances may yield more than one hydrogen ion per molecule. These acids ionize in a stepwise manner that is, they lose one proton at a time. An ionization constant expression can be written for each ionization stage. Consequently, two or more equilibrium constant expressions must often be used to calculate the concentrations of species in the acid solution. For example, for carbonic acid, H2CO3, we write... 

Table 15.5 shows the ionization constants of several diprotic acids and one polyprotic acid. For a given acid, the first ionization constant is much larger than the second ionization constant, and so on. This trend is reasonable because it is easier to remove a ion from a neutral molecule than to remove another H+ from a negatively charged ion derived from the molecule. 

TABLE 15.5 Ionization Constants of Some Common Diprotic and Polyprotic Acids in Water at 25°C... 

The first and second ionization constants of a diprotic acid H2A are and at a certain temperature. Under what conditions will [A ] =... 

Strong acid Weak acid Diprotic acid Oxyacids Organic acids Carboxyl group Amphoteric substance Ionization of water Ion-product constant... 

Among the many known examples of multiple equilibria is the ionization of diprotic acids in aqueous solution. The following equilibrium constants have been determined for carbonic acid (H2CO3) at 25°C ... 

Ionization Constants of Some Diprotic Acids and a Triprotic Acid and Their Conjugate Bases at 25°C... 

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