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Tetapan hasil kali kelarutan Fe ( OH ) 2 ​ sebesar 2 × 1 0 − 14 . Berapakah kelarutan dalam larutan yang mempunyai pH = 12 + lo g 2 ?

Tetapan hasil kali kelarutan  sebesar . Berapakah kelarutan Fe open parentheses O H close parentheses subscript 2 dalam larutan yang mempunyai ?space 

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L. Avicenna

Master Teacher

Mahasiswa/Alumni Institut Teknologi Bandung

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kelarutan adalah .

kelarutan Fe bold open parentheses O H bold close parentheses subscript bold 2 adalah bold 5 bold cross times bold 10 to the power of bold minus sign bold 11 end exponent bold space bold mol bold space italic L to the power of bold minus sign bold 1 end exponent.space  

Pembahasan

Menentukan konsentrasi Menentukan kelarutan Jadi kelarutan adalah .

Menentukan konsentrasi  O H to the power of bold minus sign bold space bold dari bold space Fe bold open parentheses O H bold close parentheses subscript bold 2  

table attributes columnalign right center left columnspacing 0px end attributes row pH equals cell 12 plus log space 2 end cell row pOH equals cell 14 minus sign pH end cell row pOH equals cell 14 minus sign left parenthesis 12 plus log space 2 right parenthesis end cell row pOH equals cell 2 minus sign log space 2 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 2 end exponent space M end cell end table 
 

Menentukan kelarutan Fe bold open parentheses O H bold close parentheses subscript bold 2

table attributes columnalign right center left columnspacing 0px end attributes row cell Fe open parentheses O H close parentheses subscript 2 left parenthesis italic s right parenthesis end cell rightwards harpoon over leftwards harpoon cell Fe to the power of 2 plus sign left parenthesis italic a italic q right parenthesis plus 2 O H to the power of minus sign end cell row blank blank cell space 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 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 2 italic s end cell row blank blank blank row cell K subscript sp end cell equals cell open square brackets Fe to the power of 2 plus sign close square brackets open square brackets O H to the power of minus sign close square brackets squared end cell row cell 2 cross times 10 to the power of negative sign 14 end exponent end cell equals cell open square brackets Fe to the power of 2 plus sign close square brackets open square brackets 2 cross times 10 to the power of negative sign 2 end exponent space M close square brackets squared end cell row cell open square brackets Fe to the power of 2 plus sign close square brackets end cell equals cell fraction numerator 2 cross times 10 to the power of negative sign 14 end exponent over denominator open square brackets 2 cross times 10 to the power of negative sign 2 end exponent space M close square brackets squared end fraction end cell row cell open square brackets Fe to the power of 2 plus sign close square brackets end cell equals cell fraction numerator 2 cross times 10 to the power of negative sign 14 end exponent over denominator 4 cross times 10 to the power of negative sign 4 end exponent space end fraction end cell row cell open square brackets Fe to the power of 2 plus sign close square brackets end cell equals cell 5 cross times 10 to the power of negative sign 11 end exponent space M end cell row cell open square brackets Fe open parentheses O H close parentheses subscript 2 close square brackets end cell equals cell 5 cross times 10 to the power of negative sign 11 end exponent space M end cell row blank blank blank row blank blank blank end table  

Jadi kelarutan Fe bold open parentheses O H bold close parentheses subscript bold 2 adalah bold 5 bold cross times bold 10 to the power of bold minus sign bold 11 end exponent bold space bold mol bold space italic L to the power of bold minus sign bold 1 end exponent.space  

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Pada suhu tertentu hasil kali kelarutan Pb ( OH ) 2 ​ = 5 ⋅ 1 0 − 10 .Tentukanlah : pH saat larutan tepat jenuh (saat akan terbentuk endapan).

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