StudentQns' chemistry questions

last SG · 2012-02-10T11:12:15+00:00

Oh ok thanks for the help! Also then why when I do titration using a pH meter, the pH will drop all the way to 4 from 10 exactly as a certain volume?http://...

EiN930 SG

Yes, for solution of Al3+ is acidic. They causes the hydrolysis of water molecules.

Al(H2O)6 3+ + H2O --> Al(H2O)5(OH) 2+ + H3O +

One of the water ligand, the electrons are attracted towards the Al3+, as a result, one of the O-H bond is weaken and broke off. The H+ is transferred to H2O to form H3O+. This account for the acidity.

The ka of Al(H2O)6 is around 7.9 x 10^-6

SBS n SMRT SG

Correct for the inorganic metal ion (though a more complete answer would include both equations and explanation).

Not so correct for the organic ion, because my question was "which organic cations are acidic" and not "which organic anions are basic".

is the cation is RNH4+

EiN930 SG

is the cation is RNH4+

Yup it is.

UltimaOnline SG

is the cation is RNH4+

You got the idea. But check your formula carefully. Your N atom kena violated.

StudentQns SG

Going back into my salt water scenario. I take the perspective of water that it increases in temperature. So does this mean that I take the perspective of the lower boiling point substance? Meaning if I put water and ethanol, then the boiling point range will be more than 78?

Then for melting point decreases which perspective do I take?

Thanks for the help

« Previous Page