(identifying metal ion)metal hydroxide precipitates

• calcium ions + sodium hydroxide

  • white precipitate
• magnesium ion + sodium hydroxide

  • white precipitate
• aluminium ion + sodium hydroxide

  • white precipitate + excess sodium hydroxide
  • this redissolves
• to distinguish between the white precipitates which metal ion was used , do the flame test
• calcium - white precipitate
• magnesium - white precipitate
• copper (ll) - blue precipitate
• iron (ll) - green precipitate
• iron (lll) - brown precipitae
• aluminium - white precipitate + excess sodium hydroxide, it dissolves