What massof Na2SO4 10H2O is needed to prepare a solution ofNa2SO4(aq)...

Na 2 SO 4 dissociates to give 2 Na and one SO 4 ion ....

What massof Na2SO4 â€¢ 10H2O is needed to prepare a solution of Na2SO4(aq) containing 1.5 Ã— 10^20...

3.8 Ratings (504 Votes)

Na₂SO₄ dissociates to give 2 Na⁺ and one SO₄^- ions

So 1.5 * 10²⁰ anions means 1.5 * 10²⁰ SO₄^- ions which means it requires 1.5 * 10²⁰ molecules of Na₂SO₄

Number of moles of Na₂SO₄ = 1.5 *10²⁰ / avagadro number

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 1.5 * 10²⁰/ 6.022 * 10²³

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 0.24908 * 10^-3 moles of Na₂SO₄

One mole of Na₂SO₄ means 322.30 gm of Na₂SO₄

So 0.24908 * 10^-3 moles of Na₂SO₄ = 322.30 * 0.24908 * 10^-3

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â =80.2785 * 10^-3

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 0.0803 gm of Na₂SO₄

Hence 0.0803 gm off Na₂SO₄ decahydrate is required to prepare solution containing 1.5 * 10²⁰ anions

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