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Sebanyak 750 mL larutan garam LNO 3 ​ dibuat sengan cara melarutkan 0,02 gram ke dalam air murni. Jika pH larutan = 5 dan pH LOH 0,05 M sebesar 9 + log 3, tentukan massa atom relatif logam L!

Sebanyak 750 mL larutan garam dibuat sengan cara melarutkan 0,02 gram begin mathsize 14px style LNO subscript 3 space end style ke dalam air murni. Jika pH larutan begin mathsize 14px style LNO subscript 3 space end style = 5 dan pH LOH 0,05 M sebesar 9 + log 3, tentukan massa atom relatif logam L!space 

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massa atom relatif logam L adalah .

massa atom relatif logam L adalah begin mathsize 14px style bold 86 bold space italic g bold space bold mol to the power of bold minus sign bold 1 end exponent end style.undefined 

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Sebanyak 750 mL garam dibuat dengan melarutkan 0,02 gram kristalnya ke dalam air. pH larutan garam adalah 5. Hal ini menandakan bahwa garam yang terbentuk adalah garam asam. Larutan 0,05 M memiliki pH .Untuk mengetahui nilai massa atom relatif logam , mula-mula perlu diketahui nilai -nya. Nilai tetapan ionisasi basa lemah dapat diperoleh dari nilai pH . Setelah diperoleh nilai , dapat dicari massa molekul relatif garam dengan menggunakan rumus hidrolisis. Setelah diperoleh nilai massa molekul relatif garam , dapat dihitung nilai massa atom relatif logam . Jadi, massa atom relatif logam L adalah .

Sebanyak 750 mL garam begin mathsize 14px style italic L N O subscript 3 end style dibuat dengan melarutkan 0,02 gram kristalnya ke dalam air. pH larutan garam adalah 5. Hal ini menandakan bahwa garam yang terbentuk adalah garam asam. Larutan begin mathsize 14px style italic L O H end style 0,05 M memiliki pH begin mathsize 14px style 9 plus log 3 end style. Untuk mengetahui nilai massa atom relatif logam begin mathsize 14px style italic L end style, mula-mula perlu diketahui nilai begin mathsize 14px style K subscript b end style-nya. Nilai tetapan ionisasi basa lemah dapat diperoleh dari nilai pH undefined.


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell pH space italic L O H space end cell equals cell space 9 plus log 3 end cell row cell pOH space end cell equals cell space 5 minus sign log 3 end cell row cell open square brackets O H to the power of minus sign close square brackets space end cell equals cell space 3 cross times 10 to the power of negative sign 5 end exponent end cell row cell left parenthesis 3 cross times 10 to the power of negative sign 5 end exponent right parenthesis squared space end cell equals cell space left parenthesis square root of K subscript b cross times M end root right parenthesis squared end cell row cell 9 cross times 10 to the power of negative sign 10 end exponent space end cell equals cell K subscript b cross times 5 cross times 10 to the power of negative sign 2 end exponent end cell row cell K subscript b italic space end cell equals cell space 1 comma 8 cross times 10 to the power of negative sign 8 end exponent end cell end table end style


Setelah diperoleh nilai undefined, dapat dicari massa molekul relatif garam undefined dengan menggunakan rumus hidrolisis.


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row blank blank pH end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 5 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell open square brackets H to the power of plus sign close square brackets space end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 10 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell blank to the power of negative sign 5 end exponent end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 10 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell blank to the power of negative sign 5 end exponent end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell square root of K subscript w over K subscript b cross times left square bracket kation space garam right square bracket end root end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 10 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell blank to the power of negative sign 5 end exponent end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell square root of fraction numerator 10 to the power of negative sign 14 end exponent over denominator 1 comma 8 cross times 10 to the power of negative sign 8 end exponent end fraction cross times left square bracket kation space garam right square bracket end root end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 10 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell blank to the power of negative sign 10 end exponent end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell space fraction numerator 10 to the power of negative sign 6 end exponent over denominator 1 comma 8 end fraction cross times left square bracket kation space garam right square bracket end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell left square bracket kation space garam right square bracket space end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 1 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank comma end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 8 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cross times end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 10 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell blank to the power of negative sign 4 end exponent end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank M end table open square brackets LNO subscript 3 close square brackets equals table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell massa over italic M subscript r end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cross times end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell 1000 over V subscript open parentheses mL close parentheses end subscript end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 1 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank comma end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 8 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cross times end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 10 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell blank to the power of negative sign 4 end exponent end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank M end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell massa over italic M subscript r end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cross times end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell 1000 over V subscript open parentheses mL close parentheses end subscript end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 1 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank comma end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 8 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cross times end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 10 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell blank to the power of negative sign 4 end exponent end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank M end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell fraction numerator 0 comma 02 space g over denominator italic M subscript r end fraction end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cross times end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell 1000 over 750 end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank italic M end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell blank subscript r end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank italic space end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 148 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank g end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank mol end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell blank to the power of negative sign 1 end exponent end cell end table end style   


Setelah diperoleh nilai massa molekul relatif garam begin mathsize 14px style italic L N O subscript 3 end style, dapat dihitung nilai massa atom relatif logam undefined.


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell 148 space g space mol to the power of negative sign 1 end exponent space end cell equals cell space italic A subscript r space L plus italic A subscript r space N plus left parenthesis 3 cross times italic A subscript r space O right parenthesis end cell row cell 148 space g space mol to the power of negative sign 1 end exponent space end cell equals cell space italic A subscript r space L plus 14 space g space mol to the power of negative sign 1 end exponent plus left parenthesis 3 cross times 16 space g space mol to the power of negative sign 1 end exponent right parenthesis end cell row cell italic A subscript r space L space end cell equals cell space 86 space g space mol to the power of negative sign 1 end exponent end cell end table end style


Jadi, massa atom relatif logam L adalah begin mathsize 14px style bold 86 bold space italic g bold space bold mol to the power of bold minus sign bold 1 end exponent end style.undefined 

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