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Jika 5 gram NH4OH dilarutkan dalam air hingga volu...

Jika 5 gram NH4OH dilarutkan dalam air hingga volumenya mencapai 100 mL ,maka pH larutan tersebut adalah .(Ar N = 14; Ar O = 16 dan Ar H = 1) (Ka = 1,8 x 10-5space

Jawaban:

NH4OH adalah salah satu contoh basa lemah. Perhitungan basa lemah yaitu:
 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row pH equals cell 14 minus sign pOH end cell 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 cell open square brackets pOH to the power of minus sign close square brackets end cell equals cell negative sign log space square root of Kb cross times Mb end root end cell row blank equals cell negative sign log space square root of Kw over Ka cross times left parenthesis fraction numerator m over denominator Mr cross times V end fraction right parenthesis end root end cell row blank equals cell negative sign log space square root of fraction numerator 10 to the power of negative sign 14 end exponent over denominator 1 comma 8 cross times 10 to the power of negative sign 5 end exponent end fraction cross times open parentheses fraction numerator 5 over denominator 35 cross times 0 comma 1 space L end fraction close parentheses end root end cell row blank equals cell negative sign log space square root of 5 comma 5 cross times 10 to the power of negative sign 10 end exponent cross times 1 comma 43 space M end root end cell row blank equals cell negative sign log space square root of 7 comma 86 cross times 10 to the power of negative sign 10 end exponent end root end cell row blank equals cell negative sign log space 2 comma 8 cross times 10 to the power of negative sign 5 end exponent end cell row blank equals cell 5 minus sign log space 2 comma 8 space end cell row pH equals cell 14 minus sign left parenthesis 5 minus sign log space 2 comma 8 right parenthesis end cell row blank equals cell 9 plus log space 2 comma 8 end cell end table end style 
 

Jadi, dapat disimpulkan jawaban yang tepat adalah 9+log 2,8.space

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