Question

1) A 24.00 −mL sample of an unknown HClO4 solution requires titration with 22.82 mL of 0.1900 M NaOH to reach the equivalence point.
What is the concentration of the unknown HClO4 solution? The neutralization reaction is:
HClO4(aq)+NaOH(aq)→H2O(l)+NaClO4(aq)

2) A 25.00 mL sample of an unknown H3PO4 solution is titrated with a 0.100 M NaOH solution. The equivalence point is reached when 26.33 mL of NaOH solution is added.
What is the concentration of the unknown H3PO4 solution?

3) An acid solution is 0.100 M in HCl and 0.200 M in H2SO4.
What volume of a 0.140 M KOH solution would have to be added to 550.0 mL of the acidic solution to neutralize completely all of the acid?

4) A tanker truck carrying 2.01×10³ kg of concentrated sulfuric acid solution tips over and spills its load. The sulfuric acid solution is 95.0% H2SO4 by mass and has a density of 1.84 g/mL.
Sodium carbonate (Na2CO3) is used to neutralize the sulfuric acid spill. How many kilograms of sodium carbonate must be added to neutralize 2.01×10³ kg of sulfuric acid solution?