60 mL NH4OH60 \mathrm{~mL} \mathrm{\ NH}_{4} \mathrm{OH}60 mL NH4OH
40 mL NH4OH40 \mathrm{~mL} \mathrm{\ NH}_ 4 \mathrm{OH}40 mL NH4OH
100 mL HCl100 \mathrm{~mL} \mathrm{\ HCl}100 mL HCl
20 mL HCl20 \mathrm{~mL} \mathrm{\ HCl}20 mL HCl