Question

find molarity H+ ions if 49g H2SO4 is dissloved 250ml solution​

Answer 1

Answer:

4 M

Explanation:

Ionisation of H₂SO₄ is as follows:

H₂SO₄ ⇒ 2 H⁺  +  SO₄²⁻

Molar mass of H₂SO₄ = 2 x 1 + 32 + 4 x 16 = 98 g

Number of moles of H₂SO₄ = Given mass/molar mass = 49/98 = 0.5 moles

From the reaction,

⇒1 mole of H₂SO₄ produces 2 moles of H⁺

⇒0.5 moles of H₂SO₄ produces 2 x 0.5 moles of H⁺ =  1 mole of H⁺

Now we have

Number of moles of H⁺ = 1 mole

Volume of solution = 250 ml = 0.250 L

Molarity = Number of moles/Volume of solution(L)

              = 1/0.25

              = 4 M

Answer 2

Answer:4 M

Explanation:

molarity is equals to number of moles dissolved in one litre of solution

And now we have to find no of moles..

Number of moles = mass of substance divided by molar mass

Molar mass of h2so4 is 98

So 48÷98= 0.5

So molarity =0.5÷0.25=2M

So molarity of h2so4 is 2M

Now h2so4 gives 2h+ and so42 -

Means 2 moles of h2so4 gives 4 moles of h+ions in 1 liter of solution

Overall Molarity of H+ ions is 4M