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NH 4 ​ OH sebanyak 7 gram dilarutkan dalam air hingga volume menjadi 500 mL. Diketahui Ar N = 14, O = 16, H = 1, dan K b ​ = 1 0 − 5 , pH larutan adalah....

 sebanyak 7 gram dilarutkan dalam air hingga volume menjadi 500 mL. Diketahui Ar N = 14, O = 16, H = 1, dan , pH larutan adalah ....  

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pH larutan adalah 11+ log 2.

pH larutan begin mathsize 14px style N H subscript 4 O H end style adalah 11 + log 2.

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adalah basa lemah. Penentuan pH terlebih dahulu ditentukan dengan menghitung Mr . Hitung Mr Hitung kemolaran Hitung . Hitung pOH dan pH. Jadi, pH larutan adalah 11+ log 2.

begin mathsize 14px style N H subscript 4 O H end style adalah basa lemah. Penentuan pH begin mathsize 14px style N H subscript 4 O H end style terlebih dahulu ditentukan dengan menghitung Mr begin mathsize 14px style N H subscript 4 O H end style.

  • Hitung Mr begin mathsize 14px style N H subscript 4 O H end style
      Mr space N H subscript 4 O H double bond Ar space N plus left parenthesis 5 cross times Ar space H right parenthesis plus Ar space O space space space space space space space space space space space space space space space space space equals 14 space g forward slash mol plus left parenthesis 5 cross times 1 space g forward slash mol right parenthesis plus 16 space g forward slash mol space space space space space space space space space space space space space space space space space equals 35 space g forward slash mol
  • Hitung kemolaran begin mathsize 14px style N H subscript 4 O H end style

             table attributes columnalign right center left columnspacing 0px end attributes row cell M space N H subscript 4 O H end cell equals cell m over Mr cross times 1000 over V end cell row cell M space N H subscript 4 O H end cell equals cell fraction numerator 7 space gram over denominator 35 end fraction cross times fraction numerator 1000 over denominator 500 space ml end fraction end cell row cell M space N H subscript 4 O H end cell equals cell 0 comma 4 space M end cell end table 

  • Hitung begin mathsize 14px style open square brackets O H to the power of minus sign close square brackets 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 square root of K subscript b cross times M end root end cell row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell square root of 10 to the power of negative sign 5 end exponent cross times 0 comma 4 end root end cell row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell square root of 4 cross times 10 to the power of negative sign 6 end exponent end root 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 3 end exponent end cell end table end style 

  • Hitung pOH dan pH.

           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 pOH equals cell negative sign log space 2 cross times 10 to the power of negative sign 3 end exponent end cell row pOH equals cell 3 minus sign log space 2 end cell row blank blank blank row pH equals cell 14 minus sign pOH end cell row pH equals cell 14 minus sign left parenthesis 3 minus sign log space 2 right parenthesis end cell row pH equals cell 11 plus log space 2 end cell end table 

Jadi, pH larutan begin mathsize 14px style N H subscript 4 O H end style adalah 11 + log 2.

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