Sebanyak 20 ml larutan asam h2z dititrasi dengan larutan basa moh 0,5 m dengan menggunakan indikator pp, titik ekivalen titrasi tercapai setelah digunakan 20 ml moh. konsentrasi larutan h2z berdasarkan hasil titrasi tersebut adalah ….

Sebanyak 20 ml larutan asam h2z dititrasi dengan larutan basa moh 0,5 m dengan menggunakan indikator pp, titik ekivalen titrasi tercapai setelah digunakan 20 ml moh. konsentrasi larutan h2z berdasarkan hasil titrasi tersebut adalah ….

Jawaban yang benar adalah 0,25 M.

Pembahasan :

Titrasi asam basa merupakan analisis kuantitatif untuk menentukan molaritas larutan asam atau basa. Rumus titrasi asam basa adalah sebagai berikut:
M₁ × V₁ × a = M₂ × V₂ × b
M₁ = konsentrasi larutan 1 (M)
V₁ = volume larutan 1 (mL)
a = valensi/jumlah ion H⁺ atau OH⁻ larutan 1
M₂ = konsentrasi larutan 2 (M)
V₂ = volume larutan 2 (mL)
b = valensi/jumlah ion H⁺ atau OH⁻ larutan 2

H₂Z → 2H⁺ + Z²⁻, dihasilkan 2 ion H⁺ sehingga valensinya 2.
MOH → M⁺ + OH⁻, dihasilkan 1 ion OH⁻, sehingga valensinya 1.
Konsentrasi larutan H₂Z dapat ditentukan dengan cara berikut (M₁ dan V₁ untuk H₂Z; M₂ dan V₂ untuk MOH):
M₁ × V₁ × a = M₂ × V₂ × b
M₁ × 20 mL × 2 = 0,5 M × 20 mL × 1
M₁ = (0,5 M × 20 mL × 1) ÷ (20 mL × 2)
M₁ = 0,25 M

Jadi, konsentrasi larutan H₂Z adalah 0,25 M.

 

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