1. Define the concentration terms molarity, normality, weight percent(w/v%) , ppm
2. A phosphoric acid (H3PO4) solution was prepared by transferring 0.0196 g to a 1-L volumetric flask and diluting the solution to the mark. Calculate the concentration of the H3PO4 solution in molarity, normality, ppm, and weight percent (w/v % and w/w % ) (Atomic mass: H=1.0000 g/ mol, P = 31.00 g/mol, O = 16.00 g/mol)
3. A sodium hydroxide solution was prepared by transferring 0.4063g to a 100-mL volumetric flask and diluting the solution to the mark. A 10-mL aliquot of this solution was transferred to a 50-mL volumetric flask and the solution we diluted to the mark. Calculate the concentration of the final sodium hydroxide solution in molarity and w/v% units.

(Atomic mass: H=1.0000 g/ mol, Na = 23.00 g/mol, O = 16.00 g/mol)

7. A student made a standard solution by transferring 0.0400 g of NaCl into a 50-ml volumetric flask, dissolving the salt and diluting to the mark. She then withdrew 5-ml aliquot with a volumetric pipet and transferred to a 50 ml volumetric flask. The solution was diluted to the mark. Calculate the concentration of the sodium in parts per million. Assume that 1 ml = 1g.

(Atomic mass Na = 23.00 g/ mol, Cl = 35.45 g/mol)