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0,2 M ( ) memiliki pH...

begin mathsize 14px style N H subscript 3 end style 0,2 M (begin mathsize 14px style Kb equals 2 cross times 10 to the power of negative sign 5 end exponent end style ) memiliki pH...undefined 

Jawaban:

Larutan begin mathsize 14px style N H subscript 3 end style adalah basa lemah dan dapat dicari pH larutan tersebut dengan menggunakan cara sebagai berikut:


begin mathsize 14px style open square brackets O H to the power of minus sign close square brackets equals square root of Kb cross times M end root open square brackets O H to the power of minus sign close square brackets equals square root of 2 cross times 10 to the power of negative sign 5 end exponent cross times 0 comma 2 end root open square brackets O H to the power of minus sign close square brackets equals square root of 4 cross times 10 to the power of negative sign 6 end exponent end root open square brackets O H to the power of minus sign close square brackets equals 2 cross times 10 to the power of negative sign 3 end exponent pOH equals minus sign log open square brackets O H to the power of minus sign close square brackets pOH equals minus sign log space 2 cross times 10 to the power of negative sign 3 end exponent pOH equals 3 minus sign log space 2 pH equals 14 minus sign pOH pH equals 14 minus sign left parenthesis 3 minus sign log space 2 right parenthesis pH equals 11 plus log space 2 end style 
 

Jadi, larutan tersebut memiliki pH 11+log 2.undefined 

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