수산화크로뮴(III) 침전

CrCl3 + 3NaOH → Cr(OH)3↓ + 3NaCl

개요

Chromium(III) chloride reacts with sodium hydroxide to form a green gelatinous precipitate of chromium(III) hydroxide (Ksp = 6.3 × 10⁻³¹). Cr(OH)₃ is amphoteric, dissolving in both excess acid and excess NaOH. In excess NaOH, it forms the green chromite ion [Cr(OH)₄]⁻.

참여 물질

역할 물질 계수 상태
반응물 수산화나트륨 NaOH 3 (aq)
생성물 염화나트륨 NaCl 3 (aq)

일상 속 예시

The green color of some gemstones like emerald is due to chromium(III) ions, the same oxidation state that produces this green precipitate.

산업적 중요성

수산화크롬(III) 침전은 특히 크롬 도금과 가죽 무두질 폐수에서 크롬을 제거하는 산업 폐수 처리에 사용됩니다.

자주 묻는 질문

What is the equation for 수산화크로뮴(III) 침전?
The balanced equation is: CrCl₃ + 3NaOH → Cr(OH)₃↓ + 3NaCl.
What type of reaction is 수산화크로뮴(III) 침전?
수산화크로뮴(III) 침전 is a 침전 reaction.
Is 수산화크로뮴(III) 침전 exothermic or endothermic?
수산화크로뮴(III) 침전 is exothermic (releases energy). The enthalpy change (ΔH) is -90.0 kJ/mol.