Find the number of moles of the ions.?

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2016-05-31 1:28 pm

Find the number of mole of sulphate ions in 15cm^3 of 0.3M sodium sulphate solution.

Find the number of mole of barium ions in 15cm^3 of 0.3M barium chloride solution.

回答 (1)

fooks

2016-05-31 2:34 pm

✔ 最佳答案

Find the number of moles of sulphate ions in 15cm³ of 0.3M sodium sulphate solution.

Solution :
No. of moles of Na₂SO₄ = (0.3 mol/L) × (15/1000 L) = 0.0045 mol

1 mole of Na₂SO₄ contains 1 mole of SO₄²⁻ ions.
No. of moles of SO₄²⁻ ions = (0.0045 mol) × 1 = 0.0045 mol

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Find the number of moles of barium ions in 15cm³ of 0.3M barium chloride solution.

Solution :
No. of moles of BaCl₂ = (0.3 mol/L) × (15/1000 L) = 0.0045 mol

1 mole of BaCl₂ contains 1 mole of Ba²⁺ ions.
No. of moles of Ba²⁺ ions = (0.0045 mol) × 1 = 0.0045 mol

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