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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