Step-by-step explanation:
Sulfuric acid (H2SO4) is a strong acid that completely dissociates in water to produce two hydrogen ions (H+) and one sulfate ion (SO4^-2).
The concentration of the sulfuric acid solution is given as 0.2 M, which means that there are 0.2 moles of H2SO4 per liter of solution.
To calculate the number of moles of hydrogen ions in 25 cm³ of this solution, we can use the following formula:
moles of H+ = concentration of H+ x volume of solution
Since each molecule of H2SO4 produces 2 hydrogen ions when it dissociates, we need to multiply the concentration of H2SO4 by 2 to get the concentration of H+:
concentration of H+ = 2 x 0.2 M = 0.4 M
Now we can plug in the values we have and solve for the number of moles of H+:
moles of H+ = 0.4 M x 0.025 L = 0.01 moles
Therefore, there are 0.01 moles of hydrogen ions in 25 cm³ of a 0.2 M sulfuric acid solution.