Question

One commercial method used to peel potatoes is to soak them in a solution of NaOH for a short time, remove them from the NaOH, and spray off the peel. The concentration of NaOH is normally in the range of 3 to 6 M. The NaOH is analyzed periodically. In one such analysis, 45.7 mL of 0.500 M H2SO4 is required to react completely with a 12.5 mL sample of NaOH solution. What is the concentration of the NaOH solution?

Answer 1

2NaOH + H2SO4 ==> Na2SO4 + 2H2O

moles H2SO4 = M x L
moles NaOH (from the equation) = 1/2 moles H2SO4
M NaOH = moles NaOH/L NaOH = ??

Answer 2

1.41

Answer 3

4.78