hello i have my biochemistry final tomorrow and i need your help guys ...
if some 1 can help me live online its better for me, my msn address is : email@example.com
we can chat and u can help me,
first problem : calculation of buffer ph
** 0.81M NH4Cl , with 0.35M NH3 ,(Kb of NH3 is 1.8*10-5 ) (1.8* ten to the power of minus five ) - what is the ph of the buffer
one of these answers , i just dont know how to do it
the second problem is :
*** an ionic crystal of 2 grams, in 400 grams water has a freezing point of 0.308c (celzius) ,The molal freezing point of water is 1.86c (celzius) , its known that this ionic crystal dissociates into 2 electrolytes , what is the molar mass ?
and last question i have is not calculation :
what are the minor bases of RNA ?
1) 6-Methyl Adenine
2) 7-Methyl Guanine
3) 2-Methyl Cytosine
4) 2-N- Methyl Guanin
Thanks So Much For Your Help And COoperation