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Berikan contoh penghitungan, bagaimana cara menentukan pH: a. Asam Kuat b. Asam Lemah c. Basa Kuat d. Basa Lemah

Berikan contoh penghitungan, bagaimana cara menentukan pH:

a.  Asam Kuat

b.  Asam Lemah

c.  Basa Kuat

d.  Basa Lemah

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S. Lubis

Master Teacher

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Pembahasan

a) Asam Kuat Larutan HCl mempunyai konsentrasi 0,01 M. Maka nilai pH nya adalah .... b) Asam Lemah pH asam formiat 0,1 M ( ) adalah .... c) Basa Kuat Larutan 0,01 M sebanyak 1 L mempunyai pH .... d) Basa Lemah Suatu larutan basa lemah MOH mempunyai konsentrasi 0,1 M dan tetapan ionisasi basa lemah , maka pH larutan adalah ....

a)  Asam Kuat

Larutan HCl mempunyai konsentrasi 0,01 M. Maka nilai pH nya adalah ....


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell H Cl end cell rightwards arrow cell H to the power of plus sign and Cl to the power of minus sign end cell row cell open square brackets H to the power of plus sign close square brackets end cell equals cell italic a italic cross times M end cell row blank equals cell 1 cross times 10 to the power of negative sign 2 end exponent end cell row blank equals cell 10 to the power of negative sign 2 end exponent end cell row pH equals cell negative sign log space open square brackets 10 to the power of negative sign 2 end exponent close square brackets end cell row blank equals 2 end table end style 


b)  Asam Lemah

pH asam formiat 0,1 M (begin mathsize 14px style K subscript a equals 10 to the power of negative sign 7 end exponent end style) adalah ....


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open square brackets H to the power of plus sign close square brackets end cell equals cell square root of K subscript italic a cross times M end root end cell row blank equals cell square root of 10 to the power of negative sign 7 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 8 end exponent end root end cell row blank equals cell 10 to the power of negative sign 4 end exponent end cell row pH equals 4 end table end style 


c)  Basa Kuat

Larutan begin mathsize 14px style Ca open parentheses O H close parentheses subscript 2 end style 0,01 M sebanyak 1 L mempunyai pH ....


begin mathsize 14px style Ca open parentheses O H close parentheses subscript 2 yields Ca to the power of 2 plus sign and 2 O H to the power of minus sign end style 


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 italic b cross times M end cell row blank equals cell 2 cross times 0 comma 01 end cell row blank equals cell 0 comma 02 space M end cell row blank equals cell 2 cross times 10 to the power of negative sign 2 end exponent space M end cell row pOH equals cell negative sign log space 2 cross times 10 to the power of negative sign 2 end exponent end cell row blank equals cell 2 minus sign log space 2 end cell row pH equals cell 14 minus sign left parenthesis 2 minus sign log space 2 right parenthesis end cell row blank equals cell 12 plus log space 2 end cell end table end style 


d)  Basa Lemah

Suatu larutan basa lemah MOH mempunyai konsentrasi 0,1 M dan tetapan ionisasi begin mathsize 14px style open parentheses K subscript b close parentheses end style basa lemah begin mathsize 14px style 10 to the power of negative sign 5 end exponent end style, maka pH larutan adalah ....


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 italic 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 space M end cell row pOH equals 3 row pH equals cell 14 minus sign 3 equals 11 end cell end table end style 

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