Question

H2SO4 (density = 1.80 gm/mL) Is 98% by weight of solution. Express Concentration in term of molarity of : (1) hydrogen ion, (2) Sulphate ion.​

Answer 1

Explanation:

in 100g solution

there is 98g H2SO4

now density =1.8g/ml

mass=100g

volume=mass/density

=100/1.8×1000g/L=1/18L

now molarity of solution

= no of moles of H2S04 = mass/molar mass=

98/98=1mol

molarity=moles/volume

=1/1/18=18M

so in H2SO4 dissociate in water as

H2SO4=====>2H^+ + 1SO4^-2

1 mole H2SO4 contains 2 mole h + ions

one mole of H2 S o4 is present in 1/18 litre of solution number of moles in 1 litre of solution is

18mol

now by diamensional analysis

2H^+/1H2SO4×18H2SO4/1L

molar concentraction of H+ ions is

36M or 36%

1SO4^-2/1H2SO4×18H2SO4/1L

=18M or 18% is molar concentration of sulphate ions