Q1. Osmometer cells in the brain sense an increase in concentration of the blood plasma. They then notify the posterior pituitary gland to release the hormone, ADH. This hormone causes the kidney to save water that lowers the concentration of the plasma.

Q2. The atomic masses of carbon, hydrogen and oxygen are 12, 1 and 16, correspondingly, what would be an approximate weight of one mole of H2CO3 (carbonic acid)?