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Hitung pH larutan berikut : 500 mL larutan yang m...

Hitung pH larutan berikut :

500 mL larutan yang mengandung 0,005 mol begin mathsize 14px style N H subscript 3 space left parenthesis Kb space N H subscript 3 space equals space 1 space. space 10 to the power of negative sign 5 end exponent right parenthesis end stylespace

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Jawaban:

Untuk mencari pH perlu diketahui dahulu kemolaran zat.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row M equals cell mol over V end cell row blank equals cell fraction numerator 0 comma 005 space mol over denominator 0 comma 5 space L end fraction end cell row blank equals cell 0 comma 01 space M end cell end table end style 

Amonia merupakan basa lemah, maka dapat menggunakan rumus 

begin mathsize 14px style 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 subscript b end root end cell row blank equals cell square root of 10 to the power of negative sign 5 end exponent cross times 0 comma 01 end root end cell row blank equals cell square root of 10 to the power of negative sign 7 end exponent end root end cell row blank equals cell 10 to the power of negative sign 3 comma 5 end exponent 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 blank equals cell negative sign log space 10 to the power of negative sign 3 comma 5 end exponent end cell row blank equals cell 3 comma 5 end cell row cell pH and pOH end cell equals 14 row pH equals cell 14 minus sign 3 comma 5 end cell row pH equals cell 10 comma 5 end cell end table end style 

Jadi, pH larutan begin mathsize 14px style N H subscript 3 end style adalah 10,5.

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