# Answered Essay: 6. Define the following units of concentration, in terms of base units. Molarity Molality parts

6. Define the following units of concentration, in terms of base units. Molarity Molality parts per million Parts per billion 7. You have 100 mL of a 25.0 μM Naci solution. How many moles of NaCl are there? 8. Express the concentration in 7 in terms of ppm and ppb. 9. How would you make the solution in 7 from a stock solution of 0.500 M NaCI?

6)

molarity : number of moles of solute present in 1 litre of solution is called molarity

molarity = moles / volume

molality : number of moles of solute present in 1 kilogram of solvent is called molarity

molarity = moles / mass of solvent (kg)

ppm : the amount of solute present 1 million parts of solution is called ppm

ppm = amount of solute x 10^6 / amount solution

ppb : the amount of solute present 1 billion parts of solution is called ppm

ppb = amount of solute x 10^9 / amount solution

7)

volume = 100 mL = 0.1 L

molarity = 25 x 10^-6 M

moles = molarity x volume

= 25 x 10^-6 x 0.1

= 2.5x 10^-6

moles = 2.5x 10^-6

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