Question

71, Rank the following oxides in terms of acidity from least (#1) to most (#5) acidic(3). Cs2O Al203 C2O P2Os Oxide Rank Li20 Pick one of the above examples and write a balanced equation for its reaction with water (2). Ilustrate how it reacts (mechanistically - use curly arrows to show electron movement) with water to form either an acid or a base(2). Be sure to include all electrons in your Lewis structures /5 2. Rank the following cations in terms of acidity from least (#1) to most(as) acidic (3) Cation Justify the acidity of Ap by completing the following equation (it is balanced on the left hand side) (2):

Answer 1

Q1: Metallic oxides are basic and basic nature increases down the group. Higher the oxidation state of central atom higher will be acidic nature. Non metal oxides are acidic.

#1- Cl₂O₇. (most acidic)

#2- P₂O₅ (acidic)

#3- Al₂O₃ (amphoteric oxide)

#4- Li₂O. (basic)

#5-Cs₂O (least acidic or most basic)

Li₂O + H₂O $\rightarrow$ 2Li(OH)

P₂O₅ + 3 H₂O $\rightarrow$ 2 H₃PO₄

Q2:

Acidic strength of cation directly proportional to Z²/r i.e (charge²/ radius)

#1- Fe³⁺

#2- Ru³⁺

#3- Pt⁴⁺

#4- Pt²⁺

#5- Mg²⁺

[Al(H₂O)₆]³⁺ + H₂O $\rightarrow$ [Al(H₂O)₅(OH)]³⁺ + H₃O⁺