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Acid-Base Properties of Salt Solutions Worksheet 1. What is a salt? How is it formed? 2. What is pK, and what does it represent? How does this value correspond to the strength of an acid? 3. What is pK, and what does it represent? How does this value correspond to the strength of a base? 4. How is pH affected by the concentration of a solution? 5. What does Kw represent? How is Kw calculated? 6. What is a hydrolysis reaction? Provide an example of a hydrolysis reaction.

Answer 1

Base salt (1) What is salt and how it is formed ? salt is chemically neutral compound formed by the neutralisation reaction of acid and base . example Nad A salt consists of eation of a base and anion of an acid. The reaction between acid and base is called Neutralization reaction so salts are formed by reaction of acid and base NaoH + HCl → Nad + H2O Aeid (3) What is pka and what does it expresent? How does this value correspond to acid strength opka is the negative logarithm of acid dissociation constant or ka value. Teka , - log o ka opka value is one method used to indicate the strength of an acid. A lower pka value indicates stronger acid that means higher acid strength. pka value indicates lower acid strength. (3) What is Pkb and what How does this value correspond to base strengthe pkle is the negative logarithm of base dissociation constant (Kb) value. pk le log to kle pk le value is one method use to indicate the strength of base. A lower pke value indicates stronger base that means higher base strength. A higher ekle value indicates lower acid strength. . A higher does it represent ? .

. to break chemical bonds in the other reactant (4) How is pH affected by concentration of solution pH = -log o CHO In general, the pH of an acid solution will be lower as the solution is more concentrated. pH of solution will be higher if concentration of raced decreases. (5) What is kw represent? How Kw is calculated • The ionic product of water (kW) is the mathematical product of the concentration of hydrogen ions and hydroside ions calculation of kW :- H20(d) 2 Htcad) tot can Kw = CH. COHO C H6 = d H 6 and thus kw=CHO The value of eHo in pure water at 25°C is 10-7. Therefore Kw of pure water at 25°e is kw (10-7)? = 10 -14 at 25°C kW in pure water is = 1.0810 -14. (6) What is Hydrolysis reaction provide an example :- Hydrolysis is the reaction by which chemical compounds are apart by addition of water, water is used In pure water e²OHO broken base Dissolving satt of weak acid or in water is an example of hydrolysis reaction. (i) e H3 CooNa + H₂O → CH3 coolH+ NaOH G7 ester hyderolysis :- CH3 coo CH₂ CH3 + H20 et3 COOH + CH₃ CH₂ OH

(7 what does Kb represent? How Kb is calculated ? • kb is the base dessociation constant The base dissociation constant is a measure of how completely a base dissociates into its component ions in water caleulation : The dissociation of weak base Bot in equilibrium dissociates BOH = B7 toh- кЬ Reactants [B+] [OH-] [BOHJ as Products Кр