Procaine hydrochloride ( mw = 272.77 g/mol) is used as a local anesthetic. calculate the molarity of a 4.666 m solution which has a density of 1.1066 g/ml.

The molarity of the solution is 2.272 mol/L

The molarity of a solution can be defined as the dissolution of the number of moles of solute divided by the 1 liter of the solution.

Given that:

the number of moles of Procaine hydrochloride = 4.666 moles

The relation for determining the number of moles = mass/molar mass

mass = no of moles × molar mass

mass = 4.666 mol × 272.77 g/mol

mass of Procaine hydrochloride = 1272.75 g

The total mass of the solution in a 1000 gram solution will be:

= 1272.75 g + 1000 g

= 2272.75  g of solution

The volume of the solution can now be estimated as:

V = 2053.81 mL

V = 2.0538 L

∴

The molarity(molar concentration C) of the solution can be computed as follows:

C = 2.272 mol/L

Therefore, we can conclude that the molarity of the solution is 2.272 mol/L

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Explanation:

Assume 1 kg water.

1. Moles of P.HCl

Then we have 4.666 mol of P.HCl

2. Mass of P.HCl

n = 4.666 mol × 272.77 g/mol = 1271.1 g

3. Total mass of solution

m = 1000 g + 1271.1 g = 2271.1 g solution

4. Volume of solution

5. Molar concentration