Chemistry QA

SBS n SMRT SG

First of all, thanks all for helping

I have some doubts on chem for clarification

1. For QA on aluminium nitrate with aqueous sodium hydroxide

A ppt will be form which dissolve. the chemical equation is like this one right.

NaOH (aq) + Al(NO3)3 (aq) --> Al(OH)3 + H20

Al(OH)3 +NaOH --> ???

why the ppt will dissolve

2. Why transitional metals will have catalytic properties

Thanks

dkcx SG

First of all, thanks all for helping

I have some doubts on chem for clarification

1. For QA on aluminium nitrate with aqueous sodium hydroxide

A ppt will be form which dissolve. the chemical equation is like this one right.

NaOH (aq) + Al(NO3)3 (aq) --> Al(OH)3 + H20

Al(OH)3 +NaOH --> ???

why the ppt will dissolve

2. Why transitional metals will have catalytic properties

Thanks

Al(OH)3 + NaOH -> Na+ [Al(OH)4]-

Regarding transition elements, i think it has something to do with their multiple charge system but i 4got how it works. I don't think O's need know this anyway.

SBS n SMRT SG

thanks...btw, Al(OH)4 is soluble??, i thought all hydroxides are insoluble except Gp I and ammonium cmpds

dkcx SG

thanks...btw, Al(OH)4 is soluble??, i thought all hydroxides are insoluble except Gp I and ammonium cmpds

It is in ionic form as a [Al(OH)4]- anion and not a compound. This is soluble

SBS n SMRT SG

oh.thanks, extra electron fm OH- ion right

thanks a lot

Darkness_hacker99 SG

Out of the topic...

Do note that Aluminium hydroxide is an amphoteric oxide which can react with both acid and alkali. Students need not not know the formula of the compound formed when amphoteric oxide react with acids/alkalis, the concept is important.

SBS n SMRT SG

yes...i am aware