Homework Help: chem

Posted by Lena on Friday, July 24, 2009 at 1:54am.

NH4Br has been dissolved into 1 L of water at 25 degrees celcius. the solution has a pH of 5.16. calculate number of grams of NH4Br.

I dont even know how to write the equation for this. Could someone please write the water + NH4 equation for me. Thanks :)

chem - DrBob222, Friday, July 24, 2009 at 4:01pm
NH4^+ + HOH ==> NH3 + H3O^+

Ka = Kw/Kb = (H3O^+)(NH3)/(NH4^+).
You know Kw and Kb, and pH, you can calculate (H3O^+), (NH3) is the same, (NH4^+) = solve for this. Then M = moles/L to solve for moles and g = mols x molar mass to solve for grams.
chem - DrBob222, Friday, July 24, 2009 at 4:17pm
By the way, not the correct spelling of celsius.
chem - Lena, Friday, July 24, 2009 at 5:38pm
Thanks a lot Dr Bob :)

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