Cuso solutions of the following salts would be acidic, neutral, or basic: BaCl,

Question

Cuso solutions of the following salts would be acidic, neutral, or basic: BaCl, (NH4)2SO4, ZnCl2,and NaCN. 9. Phenylboronic acid, C&H; sB(OH)2, is a monoprotic acid with a pK, value of 8.86. Caleulate the pH of 0.0100 mol dm phenylboronic acid. 10. The pH of a 0.1 M MCI (M is an unknown cation) was found to be 4.7. Write a net ionic equation for the hydrolysis of Mt and its corresponding equilibrium expression K,. Calculate the value of Kb 11. What is the pH of a solution that is 0.20 M HC,H,02 and 0.40 M NaC2H,0? Ka for acetic acid is 1.8x10-5

Explanation / Answer

8.

BaCl2 is the salt of the strong base and strong acid and hence it sresults neutral solution whose pH = 7.0

CuSO4 is the salt of strong acid and weak base and hence it results acidic solution whose pH < 7.0

(NH4)2SO4 is the salt os strong acid and weak base and hence it results acidic solution whose pH < 7.0

ZnCl2 is also the salt os strong acid and weak base and hence it results acidic solution whose pH < 7.0

NaCN is the salt of weak acid and strong base and hence it results in basic solution whose pH > 7.0

BaCl2 + H2O -------> NO NET Reaction occurrs

Cu2+ (aq.) + 2 H2O (l) --------> Cu(OH)2 (aq.) + 2 H+ (aq.)   ( acidic solution )

NH4+ (aq.) + H2O (l) ------------> NH4OH (aq.) + H+ (aq.)         ( Acidic solution )

Zn2+ (aq.) + 2 H2O (l) ------> Zn(OH)2 (aq.) + 2 H+ (aq.)     ( Acidic solution )

CN- (aq.) + H2O -------------> HCN (aq.) + OH- (aq.)         ( Basic solution )

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