Salts predicting acidity/basicity

Predict whether the solutions of the following salts are acidic, basic or neutral. 

Write the balanced equation for an acid-base reaction that would produce each of the following salts predict whether an aqueous solution of each salt is acidic, basic, or neutral, (a) NaNO, (b) KCN (c) Al2(S04)3 (d) Mg(CH3COO)2 (e) (NH4)2S04. 

So far we have considered salts in which only one ion undergoes hydrolysis. For salts derived from a weak acid and a weak base, both the cation and the anion hydrolyze. However, whether a solution containing such a salt is acidic, basic, or neutral depends on the relative strengths of the weak acid and the weak base. Since the mathematics associated with this type of system is rather involved, we will focus on making qualitative predictions about these solutions based on the following guidelines ... 

FOLLOW-UP PROBLEM 18.10 Write equations to predict whether solutions of the following salts are acidic, basic, or neutral (a) KCIO2 (b) CH3NH3NO3 (c) Csl. 

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

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

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

In this section, you learned why solutions of different salts have different pH values. You learned how to analyze the composition of a salt to predict whether the salt forms an acidic, basic, or neutral solution. Finally, you learned how to apply your understanding of the properties of salts to calculate the pH at the equivalence point of a titration. You used the pH to determine a suitable indicator for the titration. In section 9.2, you will further investigate the equilibria of solutions and learn how to predict the solubility of ionic compounds in solution. 

SAMPLE PROBLEM 18.10 Predicting Relative Acidity of Salt Solutions Problem Predict whether aqueous solutions of the following are acidic, basic, or neutral, and write an equation for the reaction of any ion with water ... 

What is a salt Fist some anions that behave as weak bases in water. Fist some anions that have no basic properties in water. Fist some cations that behave as weak acids in water. Fist some cations that have no acidic properties in water. Using these lists, give some formulas for salts that have only weak base properties in water. What strategy would you use to solve for the pH of these basic salt solutions Identify some salts that have only weak acid properties in water. What strategy would you use to solve for the pH of these acidic salt solutions Identify some salts that have no acidic or basic properties in water (produce neutral solutions). When a salt contains both a weak acid ion and a weak base ion, how do you predict whether the solution pH is acidic, basic, or neutral ... 

Problem 9.12. Predict whether the following salts will produce an acidic, basic, or neutral aqueous solution MgCl2, K2CO3, AICI3, NH4CI. 

Predict whether solutions of the following salts will be basic, acidic or neutral (I) phenylamine hydrochloride (C6H5NH4,C1 ), (il) ammonium ethanoate, (III) ammonium nitrate, (Iv) potassium bromide, (v) sodium carbonate. 

EXAMPLE 18-22 Predicting Which Salts Are Acidic and Which Are Basic... 

Two questions become apparent. First, how can you predict whether a particular salt solution will be acidic, basic, or neutral Then, how can you calculate the concentrations of ion and OH ion in the salt solution (or equivalently, how... 

Prediction of Whether a Salt Solution Is Acidic, Basic, or Neutral... 

Think About It It s easy to mix up pH and pOH in this type of problem. Always make a qualitative prediction regarding the pH of a salt solution first, and then check to make sure that your calculated pH agrees with your prediction. In this case, we would predict a basic pH because the anion in the salt (F ) is the conjugate base of a weak acid (HF). The calculated pH, 8.05, is indeed basic. 

Predict whether a 0.10 M solution of each of the following salts will be basic, acidic, or neutral ... 

Practice Problem A Predict whether a 0.10 Af solution of each of the following salts will be basic, acidic, or neutral (a) CH3COOLi, (b) C5H5NHCI, (c) KF, (d) KNO3, (e) KCIO4. 

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