Meagan May
Corianne Conway
•  Standardize a NaOH solution of
unknown molarity(M)
•  NaOH solution will be used in a later
part of the lab to help determine the %
of potassium and iron
»  Dissolve KHP in water and add phenolphthalein indicator »  Titrate with NaOH of unknown molarity »  Titrate un=l first permanent pink color appears »  Record volume of NaOH solu=on used. »  Repeat =tra=on with another sample of KHP 1. grams KHP → moles KHP (divide by
molar mass)
2. mL NaOH → liters NaOH
3. Molarity = mol KHP / L NaOH
1 2 0.722 0.674 0.00 0.00 37.20 0.0952 mol/L 33.82 0.0976 mol/L •  Trial One:
1. (0.722g KHP)(1 mol KHP/204.22g
KHP)=
3.54*10-3 mol KHP
2. 37.20 mL NaOH = 0.03720 L NaOH
3. M= mol/L= 3.54*10-3 mol KHP/
0.0372 L NaOH = 0.0952 mol/L
NaOH
•  Trial Two:
1. (0.674g KHP)(1 mol KHP/204.22g
KHP)=
3.30*10-3 mol KHP
2. 37.20 mL NaOH = 0.03720 L NaOH
3. M= mol/L= 3.30*10-3 mol KHP/
0.03382 L NaOH = 0.0976 mol/L
NaOH