Weak acid-strong base types

Multiatomic weak acid-strong base type of reagents For a multiatomic weak acid-strong base salt, B A, PBE of A will be ... 

Ion-exchange resins are categorized by the nature of functional groups attached to a polymeric matrix, by the chemistry of the particular polymer in the matrix, and by the porosity of the polymeric matrix. There are four primary types of functionaHty strong acid, weak acid, strong base, and weak base. Another type consists of less common stmctures in specialty resins such as those which have chelating characteristics. 

Identify the type of aqueous reaction using the symbols PPT for pre-dpitation, SA/SB for strong acid-strong base, SA/WB for strong acid-weak base, WA/SB for weak acid-strong base, and NR for no reaction. 

The simplest type of buffer is composed of a weak acid-strong base combination or a weak base-strong acid combinahon. This may be prepared... 

These can be of the strong acid/strong base, weak acid/strong base or weak base/strong acid type. The more common examples are weak acid/strong base. 

We ve seen on numerous occasions that the neutralization reaction of an acid with a base produces water and a salt. But to what extent does a neutralization reaction go to completion We must answer that question before we can make pH calculations on mixtures of acids and bases. Let s look at four types of neutralization reactions (1) strong acid-strong base, (2) weak acid-strong base, (3) strong acid-weak base, and (4) weak acid-weak base. 

We can calculate pH titration curves using the principles of aqueous solution equilibria. To understand why titration curves have certain characteristic shapes, let s calculate these curves for four important types of titration (1) strong acid-strong base, (2) weak acid-strong base, (3) weak base-strong acid, and (4) polyprotic acid-strong base. For convenience, we ll express amounts of solute in millimoles (mmol) and solution volumes in milliliters (mL). Molar concentration can thus be expressed in mmol/mL, a unit that is equivalent to mol/L ... 

Tiibing Type Acids (weak) Acids (strong) Bases (weak) Bases (strong) Vi as o Organic solvents Oxygen Salt Solutions... 

Amberlite [Rohm Haas]. TM for several types of ion-exchange resins. Insoluble cross-linked polymers of various types in minute bead form. Strong acid, weak acid, strong base, and weak base forms, each having various grades differing in... 

Check to see that the reaction occurs through hydrogen ion transfer from phosphoric acid molecules to hydroxide ions. Every weak acid-strong base reaction occurs by this type of H+ transfer. 

Calculating the pH The calculation procedure for the weak acid-strong base titration is different from that for the strong acid-strong base titration because we have to consider the partial dissociation of the weak acid and the reaction of the conjugate base with water. There are four key regions of the titration curve, each of which requires a different type of calculation to find [H30 ] ... 

Weak and strong acid-type resins are for removal of cations and are called cation exchangers. Weak and strong base resins remove anions and are called anion exchangers. In addition to these four resin types, there are specialty resins used in appHcations where higher specificity for certain ions under challenging conditions is a critical factor. 

Ion-exchange resins swell in water to an extent which depends on the amount of crosslinking in the polymer, so that columns should be prepared from the wet material by adding it as a suspension in water to a tube already partially filled with water. (This also avoids trapping air bubbles.) The exchange capacity of a resin is commonly expressed as mg equiv./mL of wet resin. This quantity is pH-dependent for weak-acid or weak-base resins but is constant at about 0.6-2 for most strong-acid or strong-base types. 

Ions such as Sr2+, which come from strong acids or strong bases, may be ignored in this type of problem. Ions such as C2H3O2, from weak acids or bases, will undergo hydrolysis. The acetate ion is the conjugate BASE of acetic acid (IQ = 1.8 x 10 5). Since acetate is not a strong base this will be a IQ problem, and OH will be produced. The equilibrium is ... 

There are a few main types of titrations a strong acid titrated with a strong base (or a strong base titrated with a strong acid) a weak acid titrated with a strong base a weak base titrated with a strong acid and a polyprotic acid titrated with a strong base. Each one of these produces characteristic results and will need to be discussed separately. For the solutions of weak acids and bases, the process is complicated by the common-ion effect. 

Considering this new H+-transfer acid-base definition, take a look at the type of acid-base reaction in which the acid is weak and the base is strong. An example is the reaction of acetic acid, HC2H3O2, the weak acid present in vinegar, with sodium hydroxide. The equation of the overall reaction is similar to that of a strong acid-strong base reaction. 

There are several types of compounds that one might attempt typically to isolate from a crude extract using an ion-exchange method strong and weak acids and bases, as well as amphoteric compounds. As both adsorption and elution processes will generally involve pH adjustments, it is wise first to determine the stability of the compound of interest at various pH values, as mentioned earlier. With information on the stability of the compound of interest at hand, one can then choose an appropriate ion-exchange process. 

Weak acids and bases cannot dissociate completely. They undergo the same type of dissociation as that of strong acids and bases, but the extent of dissociation is very little compared to strong acid or strong base dissociations. 

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