Pertanyaan

100 mL garam magnesium sulfat, MgSO 4 , dihasilkan dari percampuran basa lemah Mg(OH) 2 dan asam kuat H 2 SO 4 . Jika pH larutan garam tersebut adalah 5 – log 2, maka massa garam yang dihasilkan adalah…. (Mr MgSO 4 = 120 gram/mol ; Kw = 1 x 10 -14 ; Kb = 2 x 10 -5 )

100 mL garam magnesium sulfat, MgSO₄, dihasilkan dari percampuran basa lemah Mg(OH)₂ dan asam kuat H₂SO₄. Jika pH larutan garam tersebut adalah 5 – log 2, maka massa garam yang dihasilkan adalah…. (Mr MgSO₄ = 120 gram/mol ; Kw = 1 x 10^-14 ; Kb = 2 x 10^-5)

9,6 gram
9,5 gram
4,8 gram
4,7 gram
19,2 gram

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M. Firdhaus

Master Teacher

Mahasiswa/Alumni Universitas Jember

Jawaban terverifikasi

Pembahasan

Diketahui: Volume MgSO 4 (garam) = 100 mL = 0,1 L pH garam = 5 – log 2 Mr MgSO 4 = 120 gram/mol Kw = 1 x 10 -14 ; Kb = 2 x 10 -5 Ditanya: Massa MgSO 4 ….? Dijawab:

Diketahui: Volume MgSO₄ (garam) = 100 mL = 0,1 L

pH garam = 5 – log 2

Mr MgSO₄ = 120 gram/mol

Kw = 1 x 10^-14 ; Kb = 2 x 10^-5

Ditanya: Massa MgSO₄ ….?

Dijawab:

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