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Reaksi berikut terjadi secara spontan pada keadaan standar: V ( s ) + Cd 2 + ( a q ) → V 2 + ( a q ) + Cd ( s ) Cd ( s ) + Co 2 + ( a q ) → Cd 2 + ( a q ) + Co ( s ) Ti ( s ) + V 2 + ( a q ) → Ti 2 + ( a q ) + V ( s ) Manakah reaksi berikut yang berlangsung spontan? a. Co ( s ) + V 2 + ( a q ) → Co 2 + ( a q ) + V ( s ) b. V ( s ) + Co 2 + ( a q ) → V 2 + ( a q ) + Co ( s ) c. Cd ( s ) + Ti 2 + ( a q ) → Cd 2 + ( a q ) + Ti ( s )

Reaksi berikut terjadi secara spontan pada keadaan standar:



Manakah reaksi berikut yang berlangsung spontan?


a. 

b. 

c. 

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reaksi berlangsung spontan adalah reaksi karena memiliki sel positif.

reaksi berlangsung spontan adalah reaksi V open parentheses italic s close parentheses and Co to the power of 2 plus sign left parenthesis italic a italic q right parenthesis yields V to the power of 2 plus sign left parenthesis italic a italic q right parenthesis plus Co open parentheses italic s close parentheses karena memiliki italic E italic degree sel positif.

Pembahasan

Reaksi yang berlangsung spontan adalah reaksi yang memiliki nilai sel positif. dapat dihitung dari selisih potensial reduksi standar zat tereduksi dan potensial reduksi standar zat teroksidasi. Berdasarkan data : Maka nilai sel masing masing reaksi adalah: 1. Reaksi memiliki sel negatif, sehingga reaksi berlangsung tidak spontan. 2. Reaksi memiliki sel positif, sehingga reaksi berlangsung spontan. 3. Reaksi memiliki sel negatif, sehingga reaksi berlangsung tidak spontan. Jadi, reaksi berlangsung spontan adalah reaksi karena memiliki sel positif.

Reaksi yang berlangsung spontan adalah reaksi yang memiliki nilai italic E italic degree sel positif. italic E italic degree dapat dihitung dari selisih potensial reduksi standar zat tereduksi dan potensial reduksi standar zat teroksidasi.


Berdasarkan data italic E italic degree:


V to the power of 2 plus sign left parenthesis italic a italic q right parenthesis plus 2 e to the power of minus sign yields V open parentheses italic s close parentheses space space space italic E italic degree equals minus sign 1 comma 13 space V Cd to the power of 2 plus sign left parenthesis italic a italic q right parenthesis plus 2 e to the power of minus sign yields Cd open parentheses italic s close parentheses space space space italic E italic degree equals minus sign 0 comma 40 space V Co to the power of 2 plus sign left parenthesis italic a italic q right parenthesis plus 2 e to the power of minus sign yields Co open parentheses italic s close parentheses space space space italic E italic degree equals minus sign 0 comma 28 space V Ti to the power of 2 plus sign left parenthesis italic a italic q right parenthesis plus 2 e to the power of minus sign yields Ti open parentheses s close parentheses space space space italic E italic degree equals minus sign 1 comma 63 space V


Maka nilai italic E italic degree sel masing masing reaksi adalah:

1. Co open parentheses italic s close parentheses and V to the power of 2 plus sign left parenthesis italic a italic q right parenthesis yields Co to the power of 2 plus sign left parenthesis italic a italic q right parenthesis plus V open parentheses italic s close parentheses


table attributes columnalign right center left columnspacing 0px end attributes row cell italic E italic degree sel end cell equals cell italic E italic degree subscript V to the power of 2 plus sign forward slash V end subscript minus sign italic E italic degree subscript Co to the power of 2 plus sign forward slash Co end subscript end cell row blank equals cell left parenthesis minus sign 1 comma 13 minus sign left parenthesis minus sign 0 comma 28 right parenthesis right parenthesis space V end cell row blank equals cell negative sign 0 comma 85 space V end cell end table


Reaksi Co open parentheses italic s close parentheses and V to the power of 2 plus sign left parenthesis italic a italic q right parenthesis yields Co to the power of 2 plus sign left parenthesis italic a italic q right parenthesis plus V open parentheses italic s close parentheses memiliki italic E italic degree sel negatif, sehingga reaksi berlangsung tidak spontan.


2. V open parentheses italic s close parentheses and Co to the power of 2 plus sign left parenthesis italic a italic q right parenthesis yields V to the power of 2 plus sign left parenthesis italic a italic q right parenthesis plus Co open parentheses italic s close parentheses


table attributes columnalign right center left columnspacing 0px end attributes row cell italic E italic degree sel end cell equals cell italic E italic degree subscript Co to the power of 2 plus sign forward slash Co end subscript minus sign italic E italic degree subscript V to the power of 2 plus sign forward slash V end subscript end cell row blank equals cell left parenthesis minus sign 0 comma 28 minus sign left parenthesis minus sign 1 comma 13 right parenthesis right parenthesis space V end cell row blank equals cell plus 0 comma 85 space V end cell end table


Reaksi V open parentheses italic s close parentheses and Co to the power of 2 plus sign left parenthesis italic a italic q right parenthesis yields V to the power of 2 plus sign left parenthesis italic a italic q right parenthesis plus Co open parentheses italic s close parentheses memiliki italic E italic degree sel positif, sehingga reaksi berlangsung spontan.


3. Cd open parentheses italic s close parentheses and Ti to the power of 2 plus sign left parenthesis italic a italic q right parenthesis yields Cd to the power of 2 plus sign left parenthesis italic a italic q right parenthesis plus Ti open parentheses italic s close parentheses


table attributes columnalign right center left columnspacing 0px end attributes row cell italic E italic degree sel end cell equals cell italic E italic degree subscript Ti to the power of 2 plus sign forward slash Ti end subscript minus sign italic E italic degree subscript V to the power of 2 plus sign forward slash V end subscript end cell row blank equals cell left parenthesis minus sign 1 comma 63 minus sign left parenthesis minus sign 1 comma 13 right parenthesis right parenthesis space V end cell row blank equals cell negative sign 0 comma 50 space V end cell end table


Reaksi Cd open parentheses italic s close parentheses and Ti to the power of 2 plus sign left parenthesis italic a italic q right parenthesis yields Cd to the power of 2 plus sign left parenthesis italic a italic q right parenthesis plus Ti open parentheses italic s close parentheses memiliki italic E italic degree sel negatif, sehingga reaksi berlangsung tidak spontan.


Jadi, reaksi berlangsung spontan adalah reaksi V open parentheses italic s close parentheses and Co to the power of 2 plus sign left parenthesis italic a italic q right parenthesis yields V to the power of 2 plus sign left parenthesis italic a italic q right parenthesis plus Co open parentheses italic s close parentheses karena memiliki italic E italic degree sel positif.

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