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Suatu garam LSO 4 ​ mempunyai K s p ​ = 1 , 0 x 1 0 − 10 . Jika dalam 250 mL larutan jenuhnya mengandung 0,5825 mg , massa atom relatif L adalah ...

Suatu garam  mempunyai . Jika dalam 250 mL larutan jenuhnya mengandung 0,5825 mg begin mathsize 14px style LSO subscript 4 end style, massa atom relatif L adalah ... 

  1. begin mathsize 14px style 233 space g space mol to the power of negative sign 1 end exponent end style 

  2. begin mathsize 14px style 207 space g space mol to the power of negative sign 1 end exponent end style 

  3. begin mathsize 14px style 137 space g space mol to the power of negative sign 1 end exponent end style 

  4. begin mathsize 14px style 88 space g space mol to the power of negative sign 1 end exponent end style 

  5. begin mathsize 14px style 40 space g space mol to the power of negative sign 1 end exponent end style 

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Y. Rochmawatie

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Jawaban terverifikasi

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Diketahui: Ditanya: Massa atom relatif X Jawab: Massa atom relatif L dapat ditentukan dengan langkah sebagai berikut. 1. Menentukan kelarutan (s) 2. Menentukan mol M =s = 3. Menentukan 4. Menentukan Jadi, jawaban yang benar adalah C.

Diketahui: 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell K subscript sp space LSO subscript 4 space end cell equals cell space 1 comma 0 space x space 10 to the power of negative sign 10 end exponent end cell row cell massa space LSO subscript 4 space end cell equals cell 0 comma 5825 space mg end cell row V equals cell space 250 space ml space equals space 2 comma 5 cross times 10 to the power of negative sign 1 end exponent space L space end cell end table end style

Ditanya:

Massa atom relatif X

Jawab:

Massa atom relatif L dapat ditentukan dengan langkah sebagai berikut.


1. Menentukan kelarutan (s) begin mathsize 14px style LSO subscript 4 end style

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell LSO subscript 4 open parentheses italic s close parentheses end cell rightwards harpoon over leftwards harpoon cell L to the power of 2 plus sign left parenthesis italic a italic q right parenthesis space plus space S O subscript 4 to the power of 2 minus sign end exponent left parenthesis italic a italic q right parenthesis end cell row blank blank cell italic space italic space italic space italic s italic space italic space italic space italic space italic space italic space italic space italic space italic space italic space italic space italic space italic space italic space italic space italic space italic space italic s italic space italic space italic space italic space italic space italic space italic space italic space italic space italic space italic space italic space italic space italic space italic space italic space italic space italic space italic space italic s end cell row cell K subscript sp end cell equals cell open square brackets L to the power of 2 plus sign close square brackets space left square bracket S O subscript 4 to the power of 2 minus sign end exponent right square bracket space end cell row cell K subscript sp end cell equals cell open parentheses s close parentheses open parentheses s close parentheses end cell row cell K subscript sp end cell equals cell s squared end cell row cell s squared end cell equals cell 1 comma 0 cross times 10 to the power of negative sign 10 space end exponent end cell row cell space space space s end cell equals cell square root of 1 comma 0 cross times 10 to the power of negative sign 10 space end exponent end root end cell row cell space space space space space italic s end cell bold equals cell bold 1 bold comma bold 0 bold space italic x bold space bold 10 to the power of bold minus sign bold 5 end exponent bold space bold space end cell end table end style


2. Menentukan mol begin mathsize 14px style LSO subscript 4 end style

M begin mathsize 14px style LSO subscript 4 end style = s begin mathsize 14px style LSO subscript 4 end stylebegin mathsize 14px style 1 comma 0 cross times 10 to the power of negative sign 5 end exponent mol space L to the power of negative sign 1 space end exponent end style

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row M equals cell n over V space end cell row n equals cell M cross times V space end cell row n equals cell 1 comma 0 cross times 10 to the power of negative sign 5 end exponent mol space L to the power of negative sign 1 end exponent cross times 2 comma 5 space cross times space 10 to the power of negative sign 1 end exponent L space end cell row n equals cell 2 comma 5 cross times 10 to the power of negative sign 6 end exponent mol space space end cell end table end style


3. Menentukan begin mathsize 14px style M subscript r space LSO subscript 4 space end subscript end style

 begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row n equals cell space massa over M subscript r end cell row cell M subscript r end cell equals cell fraction numerator massa space open parentheses g close parentheses over denominator n space open parentheses mol close parentheses end fraction end cell row cell M subscript r end cell equals cell fraction numerator 0 comma 5825 space mg cross times 10 to the power of negative sign 3 end exponent space g space mg to the power of negative sign 1 end exponent over denominator 2 comma 5 cross times 10 to the power of negative sign 6 end exponent space mol end fraction end cell row cell M subscript r end cell equals cell 233 space g space mol to the power of negative sign 1 end exponent space end cell end table end style


4. Menentukan begin mathsize 14px style A subscript r space L space end style

 begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell M subscript r space LSO subscript 4 end cell equals cell left parenthesis 1 cross times A subscript r L right parenthesis plus left parenthesis 1 cross times A subscript r S right parenthesis plus left parenthesis 4 cross times A subscript r O right parenthesis end cell row 233 equals cell A subscript r L plus left parenthesis 1 cross times 32 right parenthesis plus left parenthesis 4 cross times 16 right parenthesis end cell row 233 equals cell A subscript r L plus 32 plus 64 end cell row 233 equals cell A subscript r L plus 96 end cell row cell A subscript r L end cell equals cell 137 space space end cell end table end style

 

Jadi, jawaban yang benar adalah C.

 

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