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Tentukan pH: 0,74 gr dalam 400 ml larutan

Tentukan pH:

0,74 gr begin mathsize 14px style Ca open parentheses O H close parentheses subscript 2 end style dalam 400 ml larutan

Jawaban:

begin mathsize 14px style Ca open parentheses O H close parentheses subscript 2 end style adalah basa kuat. Berikut adalah rumus pH basa kuat:

begin mathsize 14px style open square brackets O H to the power of minus sign close square brackets double bond jumlah space ion space x space M pOH equals minus sign log open square brackets O H to the power of minus sign close square brackets pH equals 14 minus sign pOH end style 

 

begin mathsize 14px style mol equals massa over Mr M equals mol over V end style 

 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row mol equals cell fraction numerator 0 comma 74 space g over denominator 74 space g forward slash mol end fraction end cell row blank equals cell 0 comma 01 space mol end cell row M equals cell fraction numerator 0 comma 01 space mol over denominator 400 space mL end fraction end cell row blank equals cell 0 comma 025 space M end cell end table end 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 

Jumlah ion begin mathsize 14px style O H to the power of minus sign end style yang dihasilkan ada 2 maka:

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 2 x 0 comma 025 space M end cell row blank equals cell 0 comma 05 space M end cell row pOH equals cell negative sign log space left parenthesis 5 x 10 to the power of negative sign 2 end exponent right parenthesis end cell row blank equals cell 2 minus sign log space 5 end cell row pH equals cell 14 minus sign left parenthesis 2 minus sign log space 5 right parenthesis end cell row blank equals cell 12 plus log space 5 end cell end table end style 

Jadi, pH dari begin mathsize 14px style Ca open parentheses O H close parentheses subscript 2 end style adalah 12+log 5.

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