2 acid and base questions

[Ice-cream]

any1 got any ideas for these 2 questions?

 

1. Identify the Lewis acid in the following reaction.

Ag+(aq) + 2NH3(aq) --> Ag(NH3)2 2+(aq)

 

2. What is the concentration of hydroxide ions in a 0.035M solution of Ba(OH)2?

 

(For Q1, I think Ag+ would be a lewis acid but what about the Ag(NH3)2 2+?)

 

(For Q2, I think it's just 0.035 x 2 but...I'm not sure if that's right coz its sort of a guess...)

 

thanx

[Crash]

for a lewis acid, it is an acceptor of lone pairs of electrons, and for q2) i think thats what i got because Ba(OH)2--> Ba2+ + 2OH.

[Ice-cream]

so that means Ag(NH3)2 2+ would be a lewis acid coz its positively charged...is that right?