snippet from my ECC notes, verbatim:

Bicarb:
Bicarb deficit is 0.3 x body weight x base excess.
Do not give your patient an iatrogenic alkalosis! You cannot treat these if you make them. 
The kidneys have to fix it.
Dilute the fuck out of your NaHCO3 – about 1:6 with sterile water. Be conservative (1/4 to 1/3 of calculated dose) you can always give more, you can’t take it away.