Question

How much of KMnO4 (in g) and how much of sulfuric acid (in mL) you would have to take to prepare 100ml solution in which the conentrations of KMnO4 is 0.5 M and concentrations of H2SO4 is 1M. Concnetration of commercially available sulfuric acid is 18M.

Answer 1

Hi,

The mlolecular weight of KMnO₄= 158.04 g/mol

To prepare 1M KMnO₄, you need to weight 158.04 g of  KMnO₄ in 1000 mL Distilled water

To prepare 0.5 M  KMnO₄, it would be 79.02 g of  KMnO₄ in 1000 mL distilled water

Therefore, to prepare 0.5 M  KMnO₄ in 1000 mL distilled water, it would be 7.902g of  KMnO₄

Now for making 1M H₂SO_4, we can use the formula

M1V1= M2V2

i,.e 1X100=18xv2

Therefore, V2 would be 5.55 mL of 18 M H₂SO₄ diluted to 100 mL with distilled water would give 1 M H₂SO₄

So, to make a solution of 0.5 M KMnO₄ and 1 MH₂SO₄ in 100 mL distilled water, take 7.902g of  KMnO₄and5.55 mL of 18 M H₂SO_4.

Hope this solves your query