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Pertanyaan

Kepingan seng sulfida bereaksi dengan larutan asam nitrat menghasilkan larutan seng sulfat, gas nitrogen monoksida dan air. Tulis persamaan reaksinya dan setarakan!

A. Nurul

Master Teacher

Mahasiswa/Alumni UIN Syarif Hidayatullah Jakarta

Jawaban terverifikasi

Pembahasan

seng sulfida = ZnS

asam nitrat  = HNO3

seng sulfat  = ZnSO4

nitrogen monoksida = NO

Air= H2O

sehingga reaksinya menjadi:

begin mathsize 14px style Zn S and H N O subscript 3 yields Zn S O subscript 4 and N O space plus H subscript 2 end style

menentukan oksidasi dan reduksi:

 

Reaksi ion :

begin mathsize 14px style S to the power of 2 minus sign yields S O subscript 4 to the power of 2 minus sign end exponent space space N O subscript 3 to the power of minus sign yields N O end style 

Penambahan H2O untuk menyetarakan O untuk ruas yang kekurangan O :

begin mathsize 14px style S to the power of 2 minus sign and 4 H subscript 2 O yields S O subscript 4 to the power of 2 minus sign end exponent space space space space space space space space space space left parenthesis 4 space atom space O right parenthesis space space N O subscript 3 to the power of minus sign yields N O plus 2 space H subscript 2 O space space space space space space space space space space space left parenthesis 3 space atom space O right parenthesis end style 

Penambahan H⁺ untuk ruas yang kekurangan H :

begin mathsize 14px style S to the power of 2 minus sign plus space 4 space H subscript 2 O yields space S O subscript 4 to the power of 2 minus sign end exponent plus 8 space H to the power of plus sign space space space space space space space space space space space left parenthesis 8 space atom space H right parenthesis space space N O subscript 3 to the power of minus sign plus space 4 space H to the power of plus sign yields N O and 2 space H subscript 2 O space space space space space space space space space space space space space space left parenthesis 4 space atom space H right parenthesis end style 

Penambahan elektron untuk menyetarakan muatan :

begin mathsize 14px style S to the power of 2 minus sign plus 4 space H subscript 2 O yields S O subscript 4 to the power of 2 minus sign end exponent space plus 8 space H to the power of plus sign and 8 e to the power of minus sign space space space space space space space left parenthesis cross times 3 right parenthesis space space N O subscript 3 to the power of minus sign plus space 4 space H to the power of plus sign space plus space 3 space e ⁻ yields N O space plus space 2 space H subscript 2 O space space space space left parenthesis cross times 8 right parenthesis end style 

Menghilangkan elektron:

Error converting from MathML to accessible text. 

Ruas kiri kanan ditambahkan 3 Zn2+:

Error converting from MathML to accessible text. 

Jadi, reaksi setara yaitu ;

Error converting from MathML to accessible text. 

 

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