Physiology Osmolarity of 4.2% solution of sodium bicarbonate is ? A 500 osmole/litre B 1000 osmole/litre C 1500 osmole/litre D 2000 osmole/litre 💡 Explanation Osmolarity of 4.2% solution of sodium bicarbonate is ? ✓ Correct Answer: B. 1000 osmole/litre