# Molarity of 95% (w/w) formic acid (HCOOH)

♦ Formic acid is supplied as a clear colorless liquid. A 95% (w/w) concentrated formic acid can be obtained from different suppliers.
♦ 95% (w/w) formic acid means that 100 g of Formic solution contains 95 g of HCOOH.
♦ The density of 95% (w/w) formic acid is 1.22 g/ml at 25° C which means that the weight of the 1 ml of formic acid is 1.22 grams at 25°C.
♦ Molarity refers to the number of moles of the solute present in 1 liter of solution.
♦ In simple words, 1 mole is equal to the atomic weight of the substance. For example, 1 mole of formic acid is equal to 46.03 grams of HCOOH (molecular weight = 46.03).

## Calculation procedure:

Step 1: Calculate the volume of 100 grams of formic acid.
Formula:
Density =  weight / volume or
Volume =  weight / density
Volume of 100 g of formic acid: 100/1.22 = 81.967 ml

Note: 95% (w/w) Formic acid means that 100 g of solution contain 95 g of HCOOH.
The volume of 100 grams of formic acid is 81.967 ml. That means 95 grams of HCOOH is present in 81.967 ml of formic acid.

Step 2: Calculate how many grams of HCOOH is present in 1000 ml of Formic acid.
81.967 ml of Formic acid contains   =      95 grams of HCOOH
1 ml of Formic acid will contain     =    95/81.967 grams of HCOOH
1000 ml of Formic acid will contain =       1000 x 95/81.967 = 1159.003 grams of HCOOH
1000 ml of formic acid will contain 1159.003 grams of HCOOH.

Step 3: Calculate the number of moles of HCOOH present in 1159.003 grams of HCOOH.
46.03 grams of HCOOH is equal to 1 mole.
1 gram of HCOOH will be equal to 1/46.03 moles.
1159.003 grams will be equal to = 1159.003 x 1/46.03 = 25.179 moles

Therefore, we can say that 1 liter of formic acid contains 25.179 moles of HCOOH or in other words molarity of 95% (w/w) Formic acid is equal to 25.179 M.

Calculator – Calculate the molarity of concentrated Formic acid (HCOOH)
Use Calculator to calculate the molarity of concentrated Formic acid (HCOOH) when concentration is given in % by mass (w/w)
Formic acid (HCOOH) Molecular weight: 46.03 g/mol

Concentration of Formic acid in % (wt/wt) : % (wt/wt)

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Density of glacial Formic acid: g/ml

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Molarity of Formic acid: 25.179 M