HCN(aq) + H20 (1) 3 H30+ (aq) + CN- (aq) Ka = H30+][CN"] – 62 x 10-10 [HCM] The equilibrium reaction shown above represents the partial ionization of the weak acid HCN (aq). A 0.200 M HCN (aq) solution has a pH ~ 4.95. If 0.05 g (0.010 mol) of NaCN (s) is added to 100 mL of 0.200 M HCN (aq), which of the following explains how and why the pH of the solution changes? a The pH will be higher than 4.95 because adding CN- will disrupt the equilibrium, resulting in an increased production of HCN that decreases the concentration of H3O+. c will disrupt the equilibrium, resulting in an increased production of HCN that decreases the concentration of ) The pH will be lower than 4.95 because adding CN H30+. c) The pH will be higher than 4.95 because CN is a strong base that can neutralize HCN. ( D ) The pH will remain close to 4.95 because the K, is so small that hardly any products form.

Achemical reaction (also known as a chemical change) produces substances that are chemically different from the starting materials. an example of a chemical reaction is the formation of water from hydrogen and oxygen gas. in a physical change, a substance changes its physical appearance but not its chemical identity. an example of physical change is the formation of liquid water from solid water, a familiar process called melting. physically, liquid water looks very different from solid water (ice) but the chemical identity, water, is the same for both. which of following changes that affect the composition of our atmosphere involve physical changes and which involve chemical reactions? oxygen gas changes to ozone during thunderstorms carbon dioxide is produced by the combustion of gasoline in an automobile engine. when coal, oil, and natural gas are decomposed in landsills they produce methane gas. freezing rain develops when a warm air mass overrides a cold air mass. fog forms from water vapor when the temperature drops below the dew point

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