Explain the following statement: The validity of a chemical analysis ultimately depends on measuring the response of the analytical procedure to known standards.
This week begins Chapter 14. A system is at equilibrium when there is no observable change with time. The reaction going from the reactants to the products is equal to the reaction going from the products to the reactants. For some reactions, there is no equilibrium point, the reaction goes until all reactants are used up. Ex. 2H 2 O 2H O 2 For other reactions, they can go both ways: N 2 4======> 2NO (that is 2upposed to be two arrows but sometimes Microsoft Word can only do so much…) Equilibrium can be physical equilibrium, such as water or mercury in a closed container at equilibrium with its vapor. Equilibrium can be chemical, such as in the reaction shown above. For a reaction aA + bB cC + dD, the equilibrium constant is determined as: c d [C] [D]
