Sodium chloride係咪帶有鹼性?

2006-11-28 7:43 pm

如題
有冇得predict個compound係呈酸or鹼性?

Cl- available to donate e-
and it is anion of strong acid HCl
咁算唔算解釋NaCl係鹼性呢???

or睇其他野?

另外,有冇一個網/表recommend可以即時查到每一element/compound的pKa呢
thanks

回答 (1)

sammykflee103

2006-11-28 9:46 pm

✔ 最佳答案

The solution should be netural. If CO2 dissolves in water, the solution becomes acidic.

NaCl, Na+ (Cation) comes from NaOH (Alkali) and Cl- (Anion) comes from HCl (acid).

Rules to remember for the salts of

Stong acid and strong base = netural

Weak acid and weak base = neutral

Stong acid and weak base = acidic

Weak acid and strong base = alkaline

Tables for acids and alkali shall be avialble at your text book:

Common stong acid: HCl, H2SO4, HNO3, HClO4, HF

Common weak acid: CH3COOH, H3PO4, H2SO3

Common stong base: NaOH, KOH

Common weak alkali: NH3, Ca(OH)2, Mg(OH)2

Moreover, strength of acid and alkali is related to the degree of dissociation to form H+ and OH- respectively. Strong one complete dissociate while weak one partly dissociate.

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