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Hitunglah pH larutan . Diketahui .

Hitunglah pH larutan N H subscript 3 space 0 comma 1 space M. Diketahui K subscript b equals 10 to the power of negative sign 5 end exponent.

Jawaban:

N H subscript 3 merupakan basa lemah. Untuk menghitung pH basa lemah dilakukan tahapan:

  • Menghitung open square brackets O H to the power of minus sign close square brackets space N H subscript 3 :

 table attributes columnalign right center left columnspacing 0px end attributes row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell square root of K subscript b cross times M end root end cell row blank equals cell square root of 10 to the power of negative sign 5 end exponent cross times 10 to the power of negative sign 1 end exponent end root end cell row blank equals cell square root of 10 to the power of negative sign 6 end exponent end root end cell row blank equals cell 10 to the power of negative sign 3 end exponent end cell end table 
 

  • Menghitung pOH N H subscript 3 :

table attributes columnalign right center left columnspacing 0px end attributes row pOH equals cell negative sign log space open square brackets O H to the power of minus sign close square brackets end cell row blank equals cell negative sign log space 10 to the power of negative sign 3 end exponent end cell row blank equals 3 end table  
 

  • Menghitung pH N H subscript 3 :

table attributes columnalign right center left columnspacing 0px end attributes row pH equals cell 14 minus sign pOH end cell row blank equals cell 14 minus sign 3 end cell row blank equals 11 end table 


Jadi, pH larutan N H subscript 3 adalah 11.

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