pH normal dari darah manusia berada pada rentang 7...

pH normal dari darah manusia berada pada rentang 7 + log2,24 sampai 7 + log2,82. Hitunglah konsentrasi ion $begin mathsize 14px style H subscript 3 O to the power of plus sign end style$ dan $begin mathsize 14px style O H to the power of minus sign end style$ dalam darah manusia yang memiliki pH 7 + log2,82.

Jawaban:

Diketahui pH darah manusia adalah $begin mathsize 14px style space 7 plus log 2 comma 82 end style$ ; sehingga nilai $begin mathsize 14px style P O H space menjadi space 14 minus sign left parenthesis 7 plus log 2 comma 82 right parenthesis equals 7 minus sign log 2 comma 82 end style$ . Konsentrasi ion $begin mathsize 14px style O H to the power of minus sign end style$ dapat diperoleh dengan melakukan antilog pada kedua bagian kanan dan kiri rumus POH.

$begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell negative sign log space open square brackets O H to the power of minus sign close square brackets end cell equals pOH row cell negative sign log space open square brackets O H to the power of minus sign close square brackets end cell equals cell 7 minus sign log space 2 comma 82 end cell row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell 2 comma 82 space x space 10 to the power of negative sign 7 end exponent space M end cell end table end style$

Selanjutnya, dapat diperoleh konsentrasi ion $begin mathsize 14px style H to the power of plus sign end style$ dengan rumus di bawah ini.

$begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell K subscript w end cell equals cell open square brackets H to the power of plus sign close square brackets open square brackets O H to the power of minus sign close square brackets space end cell row cell open square brackets H to the power of plus sign close square brackets end cell equals cell K subscript w forward slash open square brackets O H to the power of minus sign close square brackets end cell row blank equals cell left parenthesis 1 cross times 10 to the power of negative sign 14 end exponent right parenthesis forward slash left parenthesis 2 comma 82 cross times 10 to the power of negative sign 7 end exponent right parenthesis end cell row blank equals cell space 3 comma 5 cross times 10 to the power of negative sign 8 end exponent space M end cell end table end style$

Jadi, konsentrasi $begin mathsize 14px style H to the power of plus sign end style$ dan $begin mathsize 14px style O H to the power of minus sign end style$ berturut-turut adalah $begin mathsize 14px style 3 comma 5 cross times 10 to the power of negative sign 8 end exponent space M space dan space 2 comma 82 cross times 10 to the power of negative sign 7 end exponent space M end style$ .

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