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The solubility of sodium chloride is 35.9 g/100 g H2O at 20°C.

35.9 g of sodium chloride are added to 100 g of water, and all of it dissolves. Another solution is made from the same amount of salt and the same amount of water. This time, some solid remains undissolved. What factor could cause the difference?

A. Volume
B. Temperature
C. Beaker size
D. Solute purity

Answer :

Answer: The correct answer is temperature.

Explanation:

The solubility is defined as the amount of solute that can be dissolved in a given amount of solvent at specific temperature.

We are given that the solubility of NaCl is 35.9g per 100g at 20°C.

If we dissolve 35.9 grams in 100 grams of water, it is completely dissolve at this temperature.

If the temperature increases, the solubility also increases and if temperature decreases, the solubility decreases.

It is given that some solid remains undissolved, so the temperature would have been decreased, therefore the solubility decreases.

Hence, the correct answer is temperature.

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Rewritten by : Barada

the correct answer is temperature