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  4. A solution of sodium borate has a pH of approximately:

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Q. A solution of sodium borate has a pH of approximately:

JIPMERJIPMER 2001Equilibrium

Solution:

Sodium borate in solution undergoes hydrolysis and gives a strong base (sodium hydroxide) and a weak acid $ ({{H}_{3}}B{{O}_{3}}). $ Hence, its solution will be basic and consequently the pH will be > 7. $ N{{a}_{3}}B{{O}_{3}}+3{{H}_{2}}O\xrightarrow{{}}\underset{weak}{\mathop{{{H}_{3}}B{{O}_{3}}}}\,+\underset{strong}{\mathop{3NaOH}}\, $