Roboguru

Disajikan beberapa harga  senyawa pada suhu  sebagai berikut. a.  b.  c.  d.  Urutkan senyawa-senyawa tersebut dari yang paling mudah larut dalam air!

Pertanyaan

Disajikan beberapa harga K subscript sp senyawa pada suhu 25 degree C sebagai berikut.

a. K subscript sp italic space Al P O subscript 4 equals 9 comma 8 cross times 10 to the power of negative sign 21 end exponent

b. K subscript sp italic space Co subscript 3 open parentheses As O subscript 4 close parentheses subscript 2 equals 6 comma 8 cross times 10 to the power of negative sign 29 end exponent

c. K subscript sp italic space Pb open parentheses O H close parentheses subscript 2 equals 1 comma 4 cross times 10 to the power of negative sign 20 end exponent

d. K subscript sp italic space Fe S equals 8 comma 0 cross times 10 to the power of negative sign 19 end exponent

Urutkan senyawa-senyawa tersebut dari yang paling mudah larut dalam air! space 

Pembahasan Soal:

Senyawa yang paling mudah larut dalam air artinya senyawa tersebut memiliki nilai kelarutan (s) yang besar. Hubungan antara jumlah ion (n), kelarutan s), dan hasil kali kelarutan (K subscript sp) secara ringkas dapat dirumuskan sebagai berikut.

  • Jika n=2, maka K subscript sp equals s squared
  • Jika n=3, maka K subscript sp equals 4 s cubed
  • Jika n=4, maka K subscript sp equals 27 s to the power of 4
  • Jika n=5, maka K subscript sp equals 108 s to the power of 5

Dari rumus tersebut, maka besarnya kelarutan masing-masing senyawa pada soal yaitu :

a. K subscript sp italic space Al P O subscript 4 equals 9 comma 8 cross times 10 to the power of negative sign 21 end exponent


table attributes columnalign right center left columnspacing 0px end attributes row cell Al P O subscript 4 space end cell rightwards harpoon over leftwards harpoon cell space space Al to the power of 3 plus sign space plus space P O subscript 4 to the power of 3 minus sign end exponent end cell row n equals cell 2 comma space maka space K subscript sp equals s squared end cell row s equals cell square root of K subscript sp end root end cell row blank equals cell square root of 9 comma 8 cross times 10 to the power of negative sign 21 end exponent end root end cell row blank equals cell square root of 98 cross times 10 to the power of negative sign 22 end exponent end root end cell row blank equals cell 9 comma 9 cross times 10 to the power of negative sign 11 end exponent end cell end table


b. K subscript sp italic space Co subscript 3 open parentheses As O subscript 4 close parentheses subscript 2 equals 6 comma 8 cross times 10 to the power of negative sign 29 end exponent


table attributes columnalign right center left columnspacing 0px end attributes row cell Co subscript 3 open parentheses As O subscript 4 close parentheses subscript 2 space end cell rightwards harpoon over leftwards harpoon cell space 3 Co to the power of 2 plus sign space plus space 2 As O subscript 4 to the power of 3 minus sign end exponent end cell row n equals cell 5 comma space maka space K subscript sp equals 108 s to the power of 5 end cell row s equals cell fifth root of K subscript sp over 108 end root end cell row blank equals cell fifth root of fraction numerator 6 comma 8 cross times 10 to the power of negative sign 29 end exponent over denominator 108 end fraction end root end cell row blank equals cell fifth root of 0 comma 06 cross times 10 to the power of negative sign 29 end exponent end root end cell row blank equals cell fifth root of 0 comma 6 cross times 10 to the power of negative sign 30 end exponent end root end cell row blank equals cell 0 comma 9 cross times 10 to the power of negative sign 6 end exponent end cell row blank equals cell 9 cross times 10 to the power of negative sign 7 end exponent end cell end table


c. K subscript sp italic space Pb open parentheses O H close parentheses subscript 2 equals 1 comma 4 cross times 10 to the power of negative sign 20 end exponent


table attributes columnalign right center left columnspacing 0px end attributes row cell Pb open parentheses O H close parentheses subscript 2 space end cell rightwards harpoon over leftwards harpoon cell space Pb to the power of 2 plus sign space plus space 2 O H to the power of minus sign end cell row n equals cell 3 comma space maka space K subscript sp equals 4 s cubed end cell row s equals cell cube root of K subscript sp over 4 end root end cell row blank equals cell cube root of fraction numerator 1 comma 4 cross times 10 to the power of negative sign 20 end exponent over denominator 4 end fraction end root end cell row blank equals cell cube root of 0 comma 35 cross times 10 to the power of negative sign 20 end exponent end root end cell row blank equals cell cube root of 3 comma 5 cross times 10 to the power of negative sign 21 end exponent end root end cell row blank equals cell 1 comma 52 cross times 10 to the power of negative sign 7 end exponent end cell end table


d. K subscript sp italic space Fe S equals 8 comma 0 cross times 10 to the power of negative sign 19 end exponent


table attributes columnalign right center left columnspacing 0px end attributes row cell Fe S space end cell rightwards harpoon over leftwards harpoon cell space Fe to the power of 2 plus sign space plus space S to the power of 2 minus sign end cell row n equals cell s comma space maka space K subscript sp equals s squared end cell row s equals cell square root of K subscript sp end root end cell row blank equals cell square root of 8 comma 0 cross times 10 to the power of negative sign 19 end exponent end root end cell row blank equals cell square root of 80 cross times 10 to the power of negative sign 20 end exponent end root end cell row blank equals cell 8 comma 9 cross times 10 to the power of negative sign 10 end exponent end cell end table


Urutan senyawa-senyawa tersebut dari yang paling mudah larut dalam air yaitu dimulai dari yg nilai kelarutan (s) nya besar, maka Co subscript 3 open parentheses As O subscript 4 close parentheses subscript 2 comma space Pb open parentheses O H close parentheses subscript 2 comma space Fe S comma space dan space Al P O subscript 4.

Jadi, urutan senyawa-senyawa tersebut dari yang paling mudah larut dalam air adalah Co subscript 3 open parentheses As O subscript 4 close parentheses subscript 2 comma space Pb open parentheses O H close parentheses subscript 2 comma space Fe S comma space dan space Al P O subscript 4.space 

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 05 Mei 2021

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