Salts, “acid basic

Is the solution of each salt acidic, basic, or neutral For solutions that are not neutral, write equations that support your predictions. 

Are solutions of the following salts acidic, basic, or neutral For those that are not neutral, write balanced chemical equations for the reactions causing the solution to be acidic or basic. The relevant Ka and Kb values are found in Tables 7.2, 7.3, and 7.4. 

Step 3. The non-steam-volatile compounds. The alkaline solution (82) remaining in the distiUing flask from Step 2 may contain water-soluble, non-volatile acidic, basic or neutral compounds. Add dilute sulphuric acid until the solution is just acid to Congo red, evaporate to dryness, and extract the residual solid with boiling absolute ethyl alcohol extraction is complete when the undissolved salt exhibits no sign of charring when heated on a metal spatula in the Bunsen flame. Evaporate the alcoholic solution to dryness and identify the residue. 

The reactions are catalyzed by tertiary amines, quaternary ammonium salts, metal salts, and basic ion-exchange resins. The products are difficult to purify and generally contain low concentrations of acryhc acid and some diester which should be kept to a minimum since its presence leads to product instabihty and to polymer cross-linking. 

Ben2enesulfonate compounds yield very iasoluble salts which have been used for separation and identification of amino acids (89). Similarly, phosphotungstic acid forms iasoluble salts with basic amino acids such as lysiae, arginine, and cysteiae. 

Bismuth trioxide is practically insoluble in water it is definitely a basic oxide and hence dissolves in acids to form salts. Acidic properties are just barely detectable, eg, its solubiUty slightly increases with increasing base concentration, presumably because of the formation of bismuthate(III) ions, such as Bi(OH) g and related species. 

Ceric salt solutions are strongly acidic, basic salts tend to form readily, and there are no stable simple salts of weak acids. 

Reaction with vatious nucleophilic reagents provides several types of dyes. Those with simple chromophores include the hernicyanine iodide [16384-23-9] (20) in which one of the terminal nitrogens is nonheterocyclic enamine triearbocyanine iodide [16384-24-0] (21) useful as a laser dye and the merocyanine [32634-47-2] (22). More complex polynuclear dyes from reagents with more than one reactive site include the trinuclear BAB (Basic-Acidic-Basic) dye [66037-42-1] (23) containing basic-acidic-basic heterocycles. Indolizinium quaternary salts (24), derived from reaction of diphenylcyclopropenone [886-38-4] and 4-picoline [108-89-4] provide trimethine dyes such as (25), which absorb near 950 nm in the infrared (23). 

To predict whether a given salt solution will be acidic, basic, or neutral, you consider three factors in turn. 

Strategy First, decide what ions are present in the solution. Then classify each cation and anion as acidic, basic, or neutral, using Table 13.5. Finally, consider the combined effects of the two ions in each salt. 

Predict whether a salt solution is acidic, basic, or neutraL (Example 13.12 Problems 77-84) 80,83... 

To determine whether the solution of a salt will be acidic, basic, or neutral, we must consider both the cation and the anion. First we examine the anion to see whether it is the conjugate base of a weak acid. If the anion is neither acidic nor basic, we examine the cation to see whether it is an acidic metal ion or the conjugate acid of a weak base. If one ion is an acid and the other a base, as in NH4F, then the pH is affected by the reactions of both ions with water and both equilibria must be considered, as in Section 10.19. 

US4515 804 (Zyma 7.5.1985 GB-prior. 24.2.1982). salts with basic amino acids ... 

All chemicals, whether inorganic or organic, are either acidic, basic, or neutral. An example of an inorganic acid is sulfuric acid used in automobile batteries, while the acetic acid found in vinegar is an organic acid. Ammonia found in many household cleaners is a base, as are sodium carbonate and sodium hydroxide (lye). Sodium chloride (common salt) is an example of a salt because it is produced by the neutralization of hydrochloric acid with sodium hydroxide. A solution of table sugar in water is neutral (pH 7) because it does not contain hydrogen ions nor does it react with bases to produce water. 

C17-0025. Write the acid-base equilibrium that determines the pH of aqueous solutions of each of the following salts, and state whether the resulting solution is acidic, basic, or neither (a) NH4 I (b) NaClOq and (c) NaCHg CO2. ... 

C17-0028. Sodium metal reacts with ammonia to form an ionic salt, NaNH2, that contains NH2 anions. Is this salt acidic or basic, and why What reaction occurs if this salt is placed in water ... 

C17-0082. Decide if aqueous solutions of the following salts are acidic, basic, or neutral. For each, write the balanced equation that determines the pH of the solution, (a) NaHS (b) NaOI (c) LiClOq and (d) HC5 H5 NCl (pyridinium chloride). (See Appendix E for K values.)... 

The protection-deprotection reaction sequences constitute an integral part of organic syntheses such as the preparation of monomers, fine chemicals, and reaction intermediates or precursors for pharmaceuticals. These reactions often involve the use of acidic, basic or hazardous reagents and toxic metal salts [30], The solvent-free MW-accelerated protection/deprotection of functional groups, developed during the last decade, provides an attractive alternative to the conventional cleavage reactions. 

In hydrolysis, a salt reacts with water. The ions that hydrolyze do so because a weak acid or a weak base is formed. The process of hydrolysis removes ions from the solution and is the driving force for the reaction. The reaction may produce a solution that is acidic, basic or neutral according to the following chart ... 

The behavior of a salt will depend upon the acid—base properties of the ions present in the salt. The ions may lead to solutions of the salt being acidic, basic, or neutral. The pH of a solution depends on hydrolysis, a generic term for a variety of reactions with water. Some ions will undergo hydrolysis and this changes the pH. 

For example, suppose you are asked to determine if a solution of sodium carbonate, Na2C03, is acidic, basic, or neutral. Sodium carbonate is the salt of a strong base (NaOH) and a weak acid (HC03). Salts of strong bases and weak acids are basic salts. As a basic salt, we know the final answer must be basic (pH above 7). 

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