Question

59. The pH of aqueous solution of salt of weak acid and
weak base at 25°C is given by
(1) pH=7+5 (PK+pK)
(2) pH = 7+3 (pK, -pKo)
(3) pH=7 -3 (pKa –pko)
(4) pH=7–[pK, +pky]
In which of the following species bromine exhib​

Answer 1

Answer:

it will take 20 ph 7+3 plot an ad ph

Answer 2

The pH of aqueous solution of salt of weak acid and  weak base at 25°C  can have ph of basic, acidic, neutral depending on the relative strength of weak base and weak acid formed in the hydrolysis reaction

• if ka>kb=the solution will be acidic or ph is less than 7
• ka<kb= the solution will be basic or ph is greater than 7
• ka=kb =the solution will be neutral or ph is equal to 7 hence these salts are classified into three types , salts of weak acid and weak base for which
• ka=kb e.g-ch3coonh4
• kb>ka e.g-NH4CN
• Ka>kb e.g-NH4OH