Part 2. Electrolytes Solutions that contain ions will conduct electricity and ar
ID: 592657 • Letter: P
Question
Part 2. Electrolytes Solutions that contain ions will conduct electricity and are called electrolytes. In general, the higher the concentration of ions in solution the better it will conduct electricity. When ionic solids (salts) dissolve in water they dissociate completely and hydrated positive and negative ions are formed. Salts that are soluble in water are strong electrolytes because they dissociate completely in aqueous solution. Examples: Al2(SO4)3, NH3NOs. Compounds that are soluble but only partially dissociate when dissolved in water will produce relatively few ions in solution. Such compounds are poor conductors of electricity and are called weak electrolytes. Examples: H2COs (carbonic acid), HF (hydrofluoric acid). We will learn more about behavior of such compounds next semester when we discuss Acid/Base chemistry Finally, compounds that dissolve in water but produce no ions are called nonelectrolytes Examples: CH3CH20H (ethanol), C&O;&H12; (sugar). You will learn more about these compounds when you study organic chemistry A. Discuss with your group what it means "partially dissociate" and pick from the tree diagrams below the diagram that correctly models the behavior of the HF when it dissolves in water (water molecules are omitted for clarity). Please explain your choice. B. Imagine you are given equal volumes of the following solutions: 0.1M KNos(oq) 0.1M HCOs(aq) 0.1M CH 0H(aq) (methanol) 0.1M Ba(NO:)2(aq) Range these solutions in terms of their conductivity-from the worst conductor of electricity to the best. Justify your answer.Explanation / Answer
Arrangement from worst to best electric conductor.
CH3OH, H2CO3 , Ba(NO3)2 , KNO3
Methanol is non electrolyte because it will not produce ant ions in water.
Carbonic acid is weak electrolyte because it dissociates very few ions.
Barium cation in Barium nitrate is good conductor but because of its size its mobility is less.
Potassium ion in potassium nitrate is the best conductor because of its small size and high mobility.
since Barium ion and Potassium ion show hydrolysis effect but here size effect will be dominative.