Suppose you were instructed to add 38.0 g of sodium chloride (NaCl) to 100 mL of

Question

Suppose you were instructed to add 38.0 g of sodium chloride (NaCl) to 100 mL of water. Describe what you would observe under the following conditions.

a. prepared as instructed at 20°C

A. There is excess solid at the bottom of the container that goes away when stirred.

B. All of the solid dissolves.

C. There is excess solid at the bottom of the container.

Suppose you were instructed to add 38.0 g of sodium chloride (NaCl) to 100 mL of water. Describe what you would observe under the following conditions.

a. prepared as instructed at 20°C

A. There is excess solid at the bottom of the container that goes away when stirred.

B. All of the solid dissolves.

C. There is excess solid at the bottom of the container.

Explanation / Answer

Note that the solubility of NaCl at 20°C

35 g/100 mL approx

then

38-35 = 3 g of NaCl in excess

expect solid dissolution (35 g) + 3 g of NaCl not souble, i.e. ecess of solid at the bottom

choose C}

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