A) < 7
B) > 7
C) = 7
D) between 4 and 5
Correct Answer: B
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. \[N{{a}_{3}}B{{O}_{3}}+3{{H}_{2}}O\xrightarrow{{}}\underset{weak}{\mathop{{{H}_{3}}B{{O}_{3}}}}\,+\underset{strong}{\mathop{3NaOH}}\,\]
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