56 gram kristal koh(mrkoh=56) dilarutkan dalam air membentuk larutan koh yang mempunyai ph=12, volume larutan koh yang terbentuk adalah … .

56 gram kristal koh(mrkoh=56) dilarutkan dalam air membentuk larutan koh yang mempunyai ph=12, volume larutan koh yang terbentuk adalah … .

Jawaban benar adalah 10^2 liter.

Dalam perhitungan kimia, satuan mol (n) digunakan sebagai satuan jumlah. Untuk massa satu mol zat disebut massa molar (Mr). Mol (n) adalah satuan jumlah zat yang berukuran mikroskopis. Satu mol menunjukkan jumlah partikel yang terkandung dalam suatu zat. Secara matematis dirumuskan sebagai berikut.
n = massa/Mr
Keterangan:
n = mol
massa = gram
Mr = gram/mol

Langkah mengerjakan soal ini adalah sebagai berikut.
1. Menghitung mol KOH
n = massa / Mr
n = 56 gram / 56 gram/mol
n = 1 mol

2. Menghitng molaritas KOH
pH = 12
pOH = 14 – pH
pOH = 14 – 12
pOH = 2
[OH-] = 10^-2 M

[OH-] = Molaritas x valensi basa
10^-2 = Molaritas x 1
Molaritas = 10^-2 M

3. Menghitung volume KOH
V = n / molaritas
V = 1 mol / 10^-2 M
V = 10^2 liter

Jadi, volume KOH adalah 10^2 liter.

 

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