metal hydroxides

• which metal ions form a white precipitate when sodium hydroxide is added?

  • calcium
  • magnesium
  • aluminium, which dissolves when excess NaOH is added to form a colourless solution
• what colour precipitate does copper (II) form when sodium hydroxide solution is added?

  blue
• what colour precipitate does iron (II) form when sodium hydroxide solution is added?

  green
• what colour precipitate does iron (III) form when sodium hydroxide solution is added?

  brown
• equation for a metal ion w sodium hydroxide

  metal nitrate + sodium hydroxide -> sodium nitrate + metal hydroxide