chem 問題.....
點解limestone solube in sulphuric acid 呢句野唔岩？ 要係dissolve？同埋limestone係咪唔會decompose on heating？
CuO + NaOH 會唔會出PPT？
電解CuSO4,cathode用Cu,點解話cathode附近既H+ conc. 高左唔岩？
點解glucose 會係strong electrolyte？
thx..... CaSO4好似係in-soluble-_- 邊個話GLUCOSE 係STRONG electrolyte =.= 邊個話GLUCOSE 係STRONG electrolyte =.=
Zend 發表於 28-4-2009 23:42 http://www.nakuz.com/bbs/images/common/back.gif
請問點分weak 同埋 strong ？ conductivity...,其實都係比較
但glucose 基本上唔算係electrolyte...(with exception, no need to care)
佢唔會被電流分解到, by definition, not an electrolyte (in aq/ molten state, can conduct electricity + can be decomposed upon current ) conductivity...,其實都係比較
但glucose 基本上唔算係electrolyte...(with exception, no need to care)
佢唔會被電流分解到, by definition, not an electrolyte (in aq/ molten state, can conduct electricity...
Zend 發表於 29-4-2009 00:09 http://www.nakuz.com/bbs/images/common/back.gif
錦如果我拎隻CH3COOH泥同佢比,濃度一樣,
邊隻conduct得好d？
錦如果我拎隻CH3COOH泥同佢比,濃度一樣,
邊隻conduct得好d？
維記．鮮奶 發表於 29-4-2009 00:13 http://nakuz.com/bbs/images/common/back.gif
根本glucose solution都唔導電...(你用一千萬V 直流電就可能例外)
CH3COOH solution導到
根本glucose solution都唔導電...(你用一千萬V 直流電就可能例外)
CH3COOH solution導到
Zend 發表於 29-4-2009 00:19 http://www.nakuz.com/bbs/images/common/back.gif
說到底,即是個exception 吧？
那其他呢- -？ 1, 比人答左
2, 書有吧
3, 這個不會問吧,而且你都溶唔到CuO.
而且應該唔會變野, 因為佢唔係amphoteric
4,電解BRINE 果時有係因為有用到附近水的ION, 而令果REGION 變左acidic/basic...
而電解CuSO4(aq), using Cu as cathode... 1, 比人答左
2, 書有吧
3, 這個不會問吧,而且你都溶唔到CuO.
而且應該唔會變野, 因為佢唔係amphoteric
4,電解BRINE 果時有係因為有用到附近水的ION, 而令果REGION 變左acidic/basic...
而電解CuSO4(aq), using Cu ...
Zend 發表於 29-4-2009 00:31 http://www.nakuz.com/bbs/images/common/back.gif
大致都想起來了,明明是學過的東西-.-
都忘了(汗
這樣說的話,在cathode留下的應該是SO4 2-,
那anode就會增加H+ 的conc.了？