CHEM 121 Lecture Notes - Lecture 9: Combined Gas Law, Atmosphere (Unit), Torr
19 Jun 2015
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Chem121 - lecture 9 - acid/base reactions and gas laws. Reaction with carbonates and bicarbonates: produces co2 (g), a salt and water. 2hcl(aq) + k2co3 (aq) co2 (g) + 2kcl(aq) + h2o. Hbr(aq) + nahco3 (aq) co2 (g) + nabr(aq) + h2o. Reaction with metals: acids react with some metals, releasing h2 gas and forming salt. H2so4(aq) + zn(s) znso4 (aq) + h2 (g) Examples of relatively inert metals: au, ag, hg, pt. Acid hydrogens: those hydrogens that can be donated as protons. In acetic acid, ch3cooh, only the h bonded to oxygen is acidic and can be donated. Note: for h2so4 and h3so4, the h is bonded to the oxygen. Acid-base titrations: base of known concentration dropped into acid on unknown concentration (+indicator) # moles of base used = # mores of acid in sample. Ma = mbvb/va = (1. 00mol/l)(0. 01l)/(0. 02l) = 0. 500 m. Torricelli: atmosphere exerts pressure (created first barometer for measuring pressure)
