posted by bryce .
How many milliliters of 0.205 M NH3 solution will exactly react with 50.0 mL of 0.150 M H2SO4 solution?
2NH3(aq) + H2SO4(aq) → (NH4)2SO4(aq)
moles H2SO4 = M x L = ??
Using the equation coefficients, convert moles H2SO4 to moles NH3.
M NH3 = moles NH3/L NH3.
You know M and moles, solve for L and convert to mL.