唔該，我想問點解我做ｅｘｐｅｒｉｍｅｎｔ哥陣，用ｂｅａｋｅｒ裝sodium thiosulphate solution，隔了一陣ｄ ｓｏｌｕｔｉｏｎ 有ｄ白色野，其他ｇｒｏｕｐ都唔會喎，咁我想問個ｂｅａｋｅｒ會唔會係有咩呢？
2006-10-24 15:37:23 · 2 個解答 · 發問者 clarice 1 in 科學 ➔ 化學
Do you remember the experiment to investigate rate of reaction.
You put an X on a paper and put on it a beaker containing thiosulphate and HCl. Yellow ppt. of sulphur formed and make the X invisible.
So. I guess your beaker is not washed clean enough. e.g. it has acid residue.
Yellow sulphur is formed.
2006-10-24 16:54:43 · answer #1 · answered by ? 7 · 0⤊ 0⤋
你有冇做distillation架
2006-10-24 15:43:14 · answer #2 · answered by wendy 2 · 0⤊ 0⤋