bob mixed 5 mg of sodium hydroxide pellets in 100 ml of water. describe how the rate of the solution changes…

bob mixed 5 mg of sodium hydroxide pellets in 100 ml of water. describe how the rate of the solution changes when he adds 1 mg more of sodium hydroxide pellets.\na as more solute dissolves, the rate of solution decreases.\nb the rate of solution is unchanged by the concentration.\nc increasing concentration leads to an increase of rate.\nd agitate the rock salt and the warm water.

bob mixed 5 mg of sodium hydroxide pellets in 100 ml of water. describe how the rate of the solution changes when he adds 1 mg more of sodium hydroxide pellets.\na as more solute dissolves, the rate of solution decreases.\nb the rate of solution is unchanged by the concentration.\nc increasing concentration leads to an increase of rate.\nd agitate the rock salt and the warm water.

Answer

Brief Explanations:

The rate of dissolution of a solute in a solvent is related to the concentration gradient. When more solute (sodium hydroxide in this case) is added, the concentration of the solute in the solution - solvent interface increases. As the solute dissolves, the concentration of the solute in the solution increases and the driving - force for dissolution (the difference in concentration between the solid solute and the solution) decreases over time. So, as more solute dissolves, the rate of solution decreases.

Answer:

A. As more solute dissolves, the rate of solution decreases.