1920-S2-G10-CH-LM-SML-200326-electrolyte.doc - Madania...

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Introduction: At swimming pools, swimmers must leave the water for a period of time after nearby lightning strikes. Why is this so? What is special about water that we are concerned about when electricity is around? What kinds of liquids would this not be true for? Does distilled water have this same status? Consider the following: What do you see take place when a solute dissolves in a solvent? Does the solute disappear? How could you find out? What physical process is occurring at the molecular level to result in what you see happening when something dissolves? Does the same thing happen when all substances dissolve? Do salt and sugar both dissolve in the same way? How about all acids and all bases? Do they dissolve in the same way? Madania Secondary School Grade 10 Chemistry Lab Manual Electrolytes Name: ______________________________ Class: 10 __ Date: __________
1617-S2-G10-CH-WS-W16-SML-170417 Verified by Academic Coordinator: Strong and Weak Electrolytes a) Acids Acids ionize or dissociate in aqueous solution to produce hydronium ions (H 3 O + (aq)). The strength of an acid depends on the amount it ionizes or dissociates. Strong acids ionize almost completely, while weak acids ionize to a much lesser degree. Examples: Strong acid: HCl(g) + H 2 O(l) H 3 O + (aq) + Cl - (aq) 0% 100 % Ionized Weak acid: CH 3 COOH(aq) + H 2 O(l) H 3 O + (aq) + CH 3 COO - (aq) ~99% ~1% ionized Note: The dissociation of a substance with complete ionization is shown with a single forward arrow, while the dissociation of a substance with a low % ionization is shown with a double arrow.
1617-S2-G10-CH-WS-W16-SML-170417 Verified by Academic Coordinator: See animation below for illustration of a strong vs. weak acid ionizing in water: (choose ‘acid animation’ from the menu) b) Bases Bases ionize or dissociate in aqueous solution to produce hydroxide ions (OH - (aq)).

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