Question

Vitamin C (MM=176.12 g/mol) was measured by an electrochemical technique.  
2400 µL of lemon juice is diluted to 12.50 mL and the detector current was measured to be 28.88 mA.
1.800 mmol of vitamin C and 2400 µL of lemon juice are diluted to 12.50 mL and the detector current increased to 59.30 mA.
Calculate the concentration of vitamin C in lemon juice in units of mmol/L (mM).

Answer 1

1.800 mmol of vitamin C and 2400 µL of lemon juice are diluted to 12.50 mL

So 12.50 mL dilution solutions vitamin C present 1.8 mmol

1 ml solution vitamin c present = (1.8/12.5)= 0.144 mmol

So for 1 L or 1000 mL solution vitamin c present=144 mmol

Concentration=144 mmol/L