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Massa (NH 4 ) 2 SO 4 yang harus ditambahkan ke dalam 100 mL air sehingga diperoleh larutan dengan pH = 5 adalah... ( A r H = 1, N = 14, O = 16, dan S =32; K b NH 3 = 1 x 10 -5 )

Massa (NH4)2SO4 yang harus ditambahkan ke dalam 100 mL air sehingga diperoleh larutan dengan pH = 5 adalah...

(Ar H = 1, N = 14, O = 16, dan S =32; Kb NH3 = 1 x 10-5)

  1. 0,33 gram

  2. 0,66 gram

  3. 1,32 gram

  4. 2,64 gram

  5. 13,2 gram

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Y. Kartika

Master Teacher

Mahasiswa/Alumni Universitas Pendidikan Indonesia

Jawaban terverifikasi

Jawaban

jawaban yang benar adalah C.

jawaban yang benar adalah C. 

Pembahasan

Larutan (NH 4 ) 2 SO 4 merupakan larutan garam asam, karena berasal dari basa lemah dan asam kuat. Maka, untuk mencari massa(NH 4 ) 2 SO 4 yang ditambahkan yaitu dengan mengetahui Molaritasnya terlebih dahulu. Jadi, jawaban yang benar adalah C.

Larutan (NH4)2SOmerupakan larutan garam asam, karena berasal dari basa lemah dan asam kuat. Maka, untuk mencari massa (NH4)2SOyang ditambahkan yaitu dengan mengetahui Molaritasnya terlebih dahulu.

pH space equals space 5 pH space equals space minus sign space log space open square brackets H to the power of plus sign close square brackets space 5 space equals space minus sign space log space open square brackets H to the power of plus sign close square brackets space space space space space space space space space space space space space space space space space space space space space space space space space space space space space open square brackets H to the power of plus sign close square brackets space equals space 1 space x space 10 to the power of negative sign 5 end exponent space space space space space space space space left parenthesis square root of K subscript w over K subscript b space x space M subscript N H subscript 4 S O subscript 4 end subscript end root space equals space 1 space x space 10 to the power of negative sign 5 end exponent right parenthesis squared space space space fraction numerator 1 space x 10 to the power of negative sign 14 end exponent over denominator 1 space x space 10 to the power of negative sign 5 end exponent end fraction space x space M subscript N H subscript 4 S O subscript 4 end subscript space equals space 1 x space 10 to the power of negative sign 10 end exponent space space space space space space space space space space space space space space space space space space space space space M subscript N H subscript 4 S O subscript 4 end subscript space equals space fraction numerator 1 x space 10 to the power of negative sign 10 end exponent space x space 1 space x space 10 to the power of negative sign 5 end exponent over denominator 1 space x 10 to the power of negative sign 14 end exponent end fraction space space space space space space space space space space space space space space space space space space space space n subscript N H subscript 4 S O subscript 4 end subscript over V subscript N H subscript 4 S O subscript 4 end subscript space equals space fraction numerator 1 x space 10 to the power of negative sign 10 end exponent space x space 1 space x space 10 to the power of negative sign 5 end exponent over denominator 1 space x 10 to the power of negative sign 14 end exponent end fraction massa subscript N H subscript 4 S O subscript 4 end subscript over italic M subscript italic r subscript N H subscript italic 4 S O subscript italic 4 end subscript space x space fraction numerator 1 over denominator V space open parentheses L close parentheses end fraction equals fraction numerator 1 x space 10 to the power of negative sign 10 end exponent space x space 1 space x space 10 to the power of negative sign 5 end exponent over denominator 1 space x 10 to the power of negative sign 14 end exponent end fraction space space space space space space space space space space space space space space massa subscript N H subscript 4 S O subscript 4 end subscript space equals fraction numerator 1 x space 10 to the power of negative sign 10 end exponent space x space 1 space x space 10 to the power of negative sign 5 end exponent over denominator 1 space x 10 to the power of negative sign 14 end exponent end fraction x space italic M subscript italic r subscript N H subscript italic 4 S O subscript italic 4 end subscript space x space V space open parentheses L close parentheses space space space space space space space space space space space space space space massa subscript N H subscript 4 S O subscript 4 end subscript space equals fraction numerator 1 x space 10 to the power of negative sign 10 end exponent space x space 1 space x space 10 to the power of negative sign 5 end exponent over denominator 1 space x 10 to the power of negative sign 14 end exponent end fraction x space 132 space x space 0 comma 1 space open parentheses L close parentheses space space space space space space space space space space space space space space massa subscript N H subscript 4 S O subscript 4 end subscript space equals space 1 comma 32 space gram   
 

Jadi, jawaban yang benar adalah C. 

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