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Pertanyaan

Jika diketahui nilai pOH dari begin mathsize 14px style Ba open parentheses O H close parentheses subscript 2 end style sebesar (4-log 2), tentukan molaritas begin mathsize 14px style Ba open parentheses O H close parentheses subscript 2 end style tersebut!

I. Solichah

Master Teacher

Jawaban terverifikasi

Pembahasan

begin mathsize 14px style Ba open parentheses O H close parentheses subscript 2 end style merupakan basa kuat yang mengalami ionisasi sempurna dalam air. maka molaritas begin mathsize 14px style Ba open parentheses O H close parentheses subscript 2 end style dapat dihitung menggunakan persamaan berikut:

table attributes columnalign right center left columnspacing 0px end attributes row cell Ba open parentheses O H close parentheses subscript 2 end cell rightwards arrow cell Ba to the power of 2 plus sign and 2 O H to the power of minus sign end cell end table left parenthesis valensi space basa colon space 2 right parenthesis

table attributes columnalign right center left columnspacing 0px end attributes 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 4 minus sign log space 2 end cell equals cell negative sign space log space open square brackets O H to the power of minus sign close square brackets space end cell row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell 2 cross times 10 to the power of negative sign 4 end exponent M end cell row blank blank blank row cell O H to the power of minus sign end cell equals cell left square bracket Ba open parentheses O H close parentheses subscript 2 right square bracket cross times valensi space basa end cell row cell 2 cross times 10 to the power of negative sign 4 end exponent M end cell equals cell left square bracket Ba open parentheses O H close parentheses subscript 2 right square bracket cross times 2 end cell row cell left square bracket Ba open parentheses O H close parentheses subscript 2 right square bracket end cell equals cell fraction numerator 2 cross times 10 to the power of negative sign 4 end exponent M over denominator 2 end fraction end cell row blank equals cell 1 cross times 10 to the power of negative sign 4 end exponent M end cell end table 

Maka, konsentrasi begin mathsize 14px style Ba open parentheses O H close parentheses subscript 2 end style adalah begin mathsize 14px style 1 cross times 10 to the power of negative sign 4 end exponent M end style.

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