Question

At 20 degrees C, how much sodium chloride could be dissolved into 2 L of water?

Answer 1

35.89g of sodium chloride dissolves in 100g of water at 20 degrees celsius.
35.89 divided by 100 multiplied by 2000 = 718 g

Answer 2

At 20 °C, 720 g of sodium chloride could be dissolved in 2 L of water.

First, we will convert 2 L of water to grams using the following relationships:

• The density of water is 1 kg/L.
• 1 kg = 1000 g.

$2 L \times \frac{1kg}{L} \times \frac{1000g}{1kg} = 2000g$

At 20 °C, the solubility of sodium chloride is 36.0 g per 100 g water. The mass of sodium chloride that can be dissolved in 2000 g of water is:

$2000gH_2O \times \frac{36.0gNaCl}{100gH_2O} = 720 g NaCl$

At 20 °C, 720 g of sodium chloride could be dissolved in 2 L of water.

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