Calculate the number of moles in 25cm of 0.2M in sodium hydroxide.
To calculate the number of moles, we need to use the formula:
number of moles = volume (in liters) × concentration (in moles per liter)
First, we need to convert 25 cm³ to liters:
1 cm³ is equivalent to 0.001 liters
So, 25 cm³ = 25 × 0.001 = 0.025 liters
Next, we substitute the values into the formula:
number of moles = 0.025 liters × 0.2 mol/L = 0.005 moles
Therefore, there are 0.005 moles in 25 cm³ of 0.2M sodium hydroxide.