chemistry pre lab

Question

While you were cleaning the lab, you found a bottle with 

150.0 mL of liquid labeled "1.50 M Sulfuric Acid."

 Since sulfuric acid is no longer used in your lab, your advisor asks you to prepare it for waste disposal by neutralizing it.

(a) How many milliliters of a previously standardized 2.45 M NaOH would be required to neutralize this acid solution, assuming the bottle is correctly labeled?

Answer 1

Write the balanced equation:

H2SO4 + 2NaOH ==> Na2SO4 + 2H2O

moles of H2SO4 present = 150.0 ml x 1 L/1000 ml x 1.50 mol/L = 0.225 moles

moles NaOH needed = 0.225 mol H2SO4 x 2 mol NaOH/mol H2SO4 = 0.45 mol NaOH needed

To find the volume of 2.45 M NaOH needed to supply 0.45 moles NaOH:

(x L)(2.45 mol/L) = 0.45 moles

x = 0.1837 L = 183.7 mls = 184 mls of NaOH required (3 sig. figs.)