今日我係IS 堂做左個experiment , 有關''acid & building materials(limestone石灰石, marble大理石) 既reaction''
係test 既途中, HCl+limeston/marble 都釋放左CO2出黎令lime water變milky, 但之後一陣又變返colourless
我想問點解會咁?????

boiling tube 入面裝左 1/3 HCl, building material( 1/2 of HCl )
testube 入面裝左 1/3 lime water
兩支野用 rubber stopper with delivery tube (stopper 塞boiling tube, tube 放入testube)

excessive co2 turn limewater back into colourless

ATE38 :excessive co2 turn limewater back into colourless

Relevant Chemical Equation

CaCO3(s)+ CO2(g)+H2O(l)------> Ca(HCO3)2(aq)

Note that in the aqueous solution, Ca(HCO3)2 is colourless and soluble in water

junior form IS 好似只要求學生寫出HCl 同 CaCO3 會turn Lime water milkly?

Form幾Chem先會再解釋呢個observation?

MM2535 :junior form IS 好似只要求學生寫出HCl 同 CaCO3 會turn Lime water milkly?

Form幾Chem先會再解釋呢個observation?

唔係 Form 4 咩
我地岩岩先教

MM2535 :junior form IS 好似只要求學生寫出HCl 同 CaCO3 會turn Lime water milkly?

Form幾Chem先會再解釋呢個observation?

可能樓主好學問多d呢
加上而家334可能又學深o左少少呢

37B :

MM2535 :junior form IS 好似只要求學生寫出HCl 同 CaCO3 會turn Lime water milkly?

Form幾Chem先會再解釋呢個observation?

可能樓主好學問多d呢
加上而家334可能又學深o左少少呢

唔係wo.... 係個IS老師OT左去問者, 有話bouns wo~~

係唔係
calcium carbonate + hydrochloric acid
--> calcium chloride + carbon dioxide + water

carbon dioxide will turns limewater milky?

calcium hydroxide (solution) (limewater) + carbon dioxide --> calcium carbonate (limestone)+ water
↓
those contailns calcium carbonate (calcite)
e.g. marble, limestone, chalk

HW2481@AA63 :係唔係
calcium carbonate + hydrochloric acid
--> calcium chloride + carbon dioxide + water

carbon dioxide will turns limewater milky?

calcium hydroxide (solution) (limewater) + carbon dioxide --> calcium carbonate (limestone)+ water
↓
those contailns calcium carbonate (calcite)
e.g. marble, limestone, chalk

right

MM2535 :junior form IS 好似只要求學生寫出HCl 同 CaCO3 會turn Lime water milkly?

Form幾Chem先會再解釋呢個observation?

正常Form 4 1st term 會寫observation & chemical equation

tonycfchow :

MM2535 :junior form IS 好似只要求學生寫出HCl 同 CaCO3 會turn Lime water milkly?

Form幾Chem先會再解釋呢個observation?

正常Form 4 1st term 會寫observation & chemical equation

ln my school,

F.1/F.2 IS---Know that limewater can turns milky in the presence of CO2

F.3 Chem---Know and explain this observation and write word equation for this reaction

F.4 Chem---Write chemical equation for this reaction