A. What effect does particle size have on the rate at which a solute dissolves?

Question

A. What effect does particle size have on the rate at which a solute dissolves? B. Why does shaking a test tube with a solute affect the rate of dissolution? C. Effect of temperature on potassium nitrate crystals 1. 20 mL of cold water with 10g of ice no change, potassium nitrate crystals slowly dissolving as ice melts 2. Water at room temperature 3. 25mL of boiling water Explain the above 3 observations in terms of kinetic molecular theory. What can be said about the solubility of potassiumnitrate based on the above observations? crystals slowly dissolving potassium nitrate crystals dissolved immediately D. How do you classify a solute as nonpolar? E Why can a substance be a solvent in one system and a solute in another? F. What is the name of a solution which contains the maximum amount of solute at a given temperature? d Firefox kelm106,pdf

Explanation / Answer

Ans

A) Particle size play an important role in solubility of the solute in the solvent. The smaller particles have greater surface area whereas the larger ones have comparatively lesser surface area in total. Hence smaller particles dissolve faster into the solvent.

b) Shaking the test tube increases the dissolution of the solute as more of the fresh solute comes into contact with the solvent.

C) Temperature plays an imporatnt role in affecting the dissolution of solute. As the temperature increases, the kinetic energy of the particles increases , and they collide with the solvent particles , and the dissolution increases.

D) When there is equal sharing of pair of electrons between the atoms of the molecule , due to similar electronegativities , the compound is said to be non polar.

E) The solute is the component that is present in lesser amounts and solvent is the one that is present in higher amounts. So somewhere a compound can be less so called as solute , whereas in some solutions it can in the major proportions , so called as solvent.

F) Saturated solution contains the maximum amount of solute at a given temperature.

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