Question

Lidocaine, a widely used local anesthetic, it’s available as a 0.5% (w/v) Solution for injection. Calculate the mass of lidocaine and 6.0 mL of the solution. Be sure your answer has a unit symbol and is rounded to the correct number of significant digits.

Answer 1

• We are given that Lidocaine is available as 0.5%(w/v) , 0.5%(w/v) represents the amount of Lidocaine in grams per 100mL. so, 0.5% is the same as 0.5g of Lidocaine in 100ml.

,

• Since our solution has a volume of 6.0mL:

mass of Lidocaine = 6mL * (0.5g /100mL)

= 0.03g of Lidocaine in 6.0mLsolution.

This means that, in 6.0ml of this injection solution, we have 0.03g of Lidocaine .