Seng hidroksida

Seng hidroksida
Seng hidroksida
Nama
Nama IUPAC
Seng hidroksida
Penanda
Model 3D (JSmol)
3DMet {{{3DMet}}}
ChemSpider
Nomor EC
Nomor RTECS {{{value}}}
  • InChI=1S/2H2O.Zn/h2*1H2;/q;;+2/p-2 YaY
    Key: UGZADUVQMDAIAO-UHFFFAOYSA-L YaY
  • InChI=1/2H2O.Zn/h2*1H2;/q;;+2/p-2
    Key: UGZADUVQMDAIAO-NUQVWONBAV
  • [Zn+2].[OH-].[OH-]
Sifat
Zn(OH)2
Massa molar 99.424 g/mol
Penampilan Bubuk putih
Densitas 3.053 g/cm3, padat
Titik lebur 125 °C (257 °F; 398 K) (dekomposisi)
Agam dapat larut
Hasil kali kelarutan, Ksp 3.0×10−16
Kelarutan dalam Alkohol Tidak dapat larut
−67.0·10−6 cm3/mol
Termokimia
Entalpi pembentukan standar (ΔfHo) −642 kJ·mol−1[1]
Bahaya
Titik nyala Non-flammable
Senyawa terkait
Anion lain
 Seng oksida
Kation lainnya
 Kadmium hidroksida
Kecuali dinyatakan lain, data di atas berlaku pada suhu dan tekanan standar (25 °C [77 °F], 100 kPa).
YaY verifikasi (apa ini YaYN ?)
Referensi

Seng hidroksida adalah senyawa anorganik dengan rumus kimia Zn(OH)2. Senyawa ini juga muncul secara alami di dalam tiga mineral langka, yaitu wülfingite (ortorombik), ashoverit dan sweetit (keduanya tetragonal).

Seperti hidroksida logam-logam lainnya (seperti timbal hidroksida, aluminium hidroksida, berilium hidroksida, timah hidroksida dan kromium hidroksida), seng hidroksida bersifat amfoter. Maka dari itu, senyawa ini dapat larut dalam asam kuat serti asam klorida dan juga larutan alkali seperti natrium hidroksida.

Preparasi

Senyawa ini dapat dibuat dengan menambahkan natrium hidroksida ke dalam larutan garam seng asalkan jumlah natrium hidroksida yang dimasukkan tidak berlebihan. Seng hidroksida akan dihasilkan dalam bentuk endapan berwarna putih:

Zn2+ + 2 OH− → Zn(OH)2.

Jika jumlah natrium hidroksida yang ditambahkan terlalu banyak, endapan seng hidroksida akan kembali larut dan membentuk larutan yang tidak berwarna:

Zn(OH)2 + 2 OH− → Zn(OH)42−.

Referensi

  1. ^ Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. hlm. A23. ISBN 0-618-94690-X. 
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