Answer:
0.22825 M or 0.22825 mol/dm3
Explanation:
From the principle of Dilution, the number of moles of solute remains the same in spite of the increase in volume of solution.
The number of moles of H2SO4 before dilution is given by
nb = CbVb/1000........................................................ (1)
where
nb= number of moles of acid before dilution
Cb = concentration of acid before dilution, Cb =?
Vb =volume of acid before dilution, Vb= 20mL
After dilution, we have:
na = CaVa/1000........................................................................... (2)
Where:
na= number of moles of acid after dilution
Ca = concentration of acid after dilution, Ca= 0.04565 M
Va =volume of acid after dilution, Va= 100mL
According to the principle of dilution:
nb = na.................................................... (3)
CbVb/1000 = CaVa/1000
CbVb=CaVa..............................................(4)
making Cb the subject of the formula, we have:
Cb= CaVa/Vb
= 0.04565 x 100/20
= 0.22825 mol/dm3 or 0.22825 M
