30% stock solution of potassium permanganate (KMnO4) was diluted four times as follows: 0.1 ml of
stock was added to 0.4 mL of distilled water; 4.5 mL of distilled water was added; the resulting solution was
diluted 1:3; the resulting solution was again diluted to 0.06 L The final concentration of the solution was:
1.36%
50 mg/ml
5 mg/ml
0.05%