Question

1)

Calculate the concentration of the following
3
a) 0.1 moles of NaCl in 200 cm³
b) 0.2 moles of H₂SO4 in 100 cm³
c) 0.02 moles of NaOH in 25 cm³

Answer 1



Step-by-step explanation:

a) To calculate the concentration of NaCl, we first need to convert the volume from cm³ to liters:

200 cm³ = 0.2 L

Then we can use the formula:

concentration (in moles per liter) = moles of solute / volume of solution (in liters)

concentration = 0.1 moles / 0.2 L = 0.5 moles per liter

Therefore, the concentration of NaCl is 0.5 M.

b) We can use the same formula as in part (a):

concentration = moles of solute / volume of solution (in liters)

concentration = 0.2 moles / 0.1 L = 2 moles per liter

Therefore, the concentration of H₂SO4 is 2 M.

c) Again, we use the same formula:

concentration = moles of solute / volume of solution (in liters)

To calculate the volume in liters, we need to convert 25 cm³ to liters:

25 cm³ = 0.025 L

concentration = 0.02 moles / 0.025 L = 0.8 moles per liter

Therefore, the concentration of NaOH is 0.8 M.