Calculate the number of hydrogen ions in 5cm3 of 0.5 molar phosphoric acid.(L=6.0×10²³)
To calculate the number of hydrogen ions in a solution, we need to use Avogadro's number and the concentration of the solution.
Given:
Volume of the solution = 5 cm^3
Concentration of phosphoric acid = 0.5 M
Avogadro's number (L) = 6.0×10²³
Step 1: Convert the volume from cm^3 to liters
1 cm^3 = 1 × 10^-3 liters
Therefore, the volume of the solution in liters = 5 × 10^-3 liters
Step 2: Calculate the number of moles of phosphoric acid
Moles = Concentration × Volume
Moles = 0.5 M × 5 × 10^-3 L
Moles = 2.5 × 10^-3 moles
Step 3: Calculate the number of hydrogen ions using Avogadro's number
Number of hydrogen ions = Moles × Avogadro's number
Number of hydrogen ions = 2.5 × 10^-3 moles × 6.0×10²³
Number of hydrogen ions = 1.5 × 10²¹ ion
Therefore, there are 1.5 × 10²¹ hydrogen ions in 5 cm^3 of 0.5 molar phosphoric acid.