0.150 L of 0.490 M H2SO4 is mixed with 0.100 L of 0.250 M KOH. What concentration of sulfuric acid remains after neutralization?

Answer 1

Write the equation and balance it.
moles KOH = M x L
moles H2SO4 = M x L.
Remembering that it takes 2 moles KOH for every 1 mole H2SO4, determine which is in excess and subtract.