To test the purity of sodium bicarbonate, you dissolve a 3.50g sample in water and add sulfuric acid. if 1.04g of carbon dioxide forms, what is the percent purity of the sodium bicarbonate?

Question

Flakey

Chemistry

1 January, 15:46

To test the purity of sodium bicarbonate, you dissolve a 3.50g sample in water and add sulfuric acid. if 1.04g of carbon dioxide forms, what is the percent purity of the sodium bicarbonate?

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Aliyah Wallace · Answer 1

Answer is: the percent purity of the sodium bicarbonate is 56.83 %.

1. Chemical reaction: 2NaHCO₃ + H₂SO₄ → 2CO₂ + 2H₂O + Na₂SO₄.

2. m (NaHCO₃) = 3.50 g

n (NaHCO₃) = m (NaHCO₃) : M (NaHCO₃).

n (NaHCO₃) = 3.50 g : 84 g/mol.

n (NaHCO₃) = 0.042 mol.

3. From chemical reaction: n (NaHCO₃) : n (CO₂) = 1 : 1.

n (CO₂) = 0.042 mol.

m (CO₂) = 0.042 mol · 44 g/mol.

m (CO₂) = 1.83 g.

4. the percent purity = 1.04 g/1.83 g ·100%.

the percent purity = 56.8 %.