Calculate the the solution made dissolving naoh water

Solved Step by Step With Explanation- Buffer pH and NaOH Calculation

Questions

c. A solution is made by dissolving 2.26 g of NaOH (molar mass =39.997 g/mol ) in 500 mL of water. Calculate the pH of the solution assuming the volume remains constant.

Answer

Where:

pKa = -log(Ka)

[A-] = [HCOO-] = 0.016 M (concentration of sodium formate)

[HA] = [HCOOH] = 0.016 M (concentration of formic acid)

pH = 3.74 + log(1)

Since the log of 1 is 0, the pH of the buffer solution is approximately 3.74.

c. To calculate the pH of the solution made by dissolving 2.26 g of NaOH in 500 mL of water, you can follow these steps:

Calculate the number of moles of NaOH:

Concentration of OH- = Moles / Volume (L)

Concentration of OH- = 0.0565 mol / 0.5 L (500 mL = 0.5 L)

Calculate the pH using the relation between pH and pOH:

pH = 14 - pOH