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Tentukan massa NaOH yang mempunyai p H 12 dalam 250 mL larutan! ( A r ​ Na = 23, O = 16, dan H = 1)

Tentukan massa NaOH yang mempunyai pH 12 dalam 250 mL larutan! ( Na = 23, begin mathsize 14px style italic A subscript r end style O = 16, dan begin mathsize 14px style italic A subscript r end style H = 1)

  1. 20 gram space 

  2. 40 gram space 

  3. 80 gram undefined 

  4. 120 gram undefined 

  5. 160 gram undefined 

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Menentukan konsentrasi NaOH: Menentukan massa NaOH: sehingga massa NaOH adalah 0,1 gram. Jadi, tidak ada jawaban yang benar.

Menentukan konsentrasi NaOH:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell italic p H end cell equals cell 14 minus sign italic p O H end cell row 12 equals cell 14 minus sign italic p O H end cell row cell italic p O H end cell equals 2 end table end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell italic p O H end cell equals cell negative sign space log space open square brackets O H to the power of minus sign close square brackets end cell row 2 equals cell negative sign space log space open square brackets O H to the power of minus sign close square brackets end cell row cell negative sign space log space 10 to the power of negative sign 2 end exponent end cell equals cell negative sign space log space open square brackets O H to the power of minus sign close square brackets end cell row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell 10 to the power of negative sign 2 end exponent end cell end table end style 

 

Menentukan massa NaOH:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell n subscript NaOH end cell equals cell M cross times V end cell row blank equals cell 10 to the power of negative sign 2 end exponent cross times 250 end cell row blank equals cell 2 comma 5 space mmol end cell row blank equals cell 0 comma 0025 space mol end cell end table end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell italic M subscript r subscript NaOH end cell equals cell left parenthesis 1 cross times italic A subscript r space Na right parenthesis plus left parenthesis 1 cross times italic A subscript r space O right parenthesis plus left parenthesis 1 cross times italic A subscript r space H right parenthesis end cell row blank equals cell left parenthesis 1 cross times 23 right parenthesis plus left parenthesis 1 cross times 16 right parenthesis plus left parenthesis 1 cross times 1 right parenthesis end cell row blank equals cell 40 space g space mol to the power of negative sign 1 end exponent end cell end table end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell m subscript NaOH end cell equals cell n cross times Mr end cell row blank equals cell 0 comma 0025 cross times 40 end cell row blank equals cell 0 comma 1 space g end cell end table end style 

sehingga massa NaOH adalah 0,1 gram.

Jadi, tidak ada jawaban yang benar.

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