You use 11 ml of a 1M H2SO4 solution to titrate 6ml of ammonium hydroxide solution. What was the concentration of the ammonium hydroxide solution?

H2SO4 + 2NH4OH==> (NH4)2SO4 + 2H2O

mols H2SO4 used = M x L = ??
Convert moles H2SO4 to moles NH4OH using the coefficients in the balanced equation.
moles NH4OH = moles H2SO4 x (2 moles NH4OH/1 mole H2SO4) = ??
Then convert moles NH4OH to M from
M = moles/L. You know moles and L.