Zinc Hydroxide Precipitation

ZnSO4 + 2NaOH → Zn(OH)2↓ + Na2SO4

ภาพรวม

Zinc sulfate reacts with sodium hydroxide to form a white gelatinous precipitate of zinc hydroxide (Ksp = 3.0 × 10⁻¹⁷). Zn(OH)₂ is amphoteric, dissolving in excess NaOH to form the zincate ion [Zn(OH)₄]²⁻. This amphoteric behavior is a diagnostic test for zinc in qualitative analysis.

ผู้เข้าร่วม

บทบาท สาร สัมประสิทธิ์ สถานะ
สารตั้งต้น Zinc Sulfate ZnSO₄ 1 (aq)
สารตั้งต้น Sodium Hydroxide NaOH 2 (aq)
ผลิตภัณฑ์ Sodium Sulfate Na₂SO₄ 1 (aq)

ตัวอย่างในชีวิตประจำวัน

Calamine lotion contains zinc compounds that form protective precipitates on skin, soothing itching from insect bites and rashes.

ความสำคัญทางอุตสาหกรรม

Zinc hydroxide precipitation is used in zinc recovery from wastewater, in calamine lotion production, and as a precursor to zinc oxide.

Frequently Asked Questions

What is the equation for Zinc Hydroxide Precipitation?
The balanced equation is: ZnSO₄ + 2NaOH → Zn(OH)₂↓ + Na₂SO₄.
What type of reaction is Zinc Hydroxide Precipitation?
Zinc Hydroxide Precipitation is a precipitation reaction.
Is Zinc Hydroxide Precipitation exothermic or endothermic?
Zinc Hydroxide Precipitation is exothermic (releases energy). The enthalpy change (ΔH) is -38.0 kJ/mol.