chem notes 10-01

Chem notes 10-01 - -variable that measures amount of substance per unit volume(molarity = M-molarity – amount of solute in moles present in a

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October 1, 2007 Dr. Stevens Gen. Chem. 1 Acids and Bases -acids have H+ that can be donated (H+) HCl H2O H3O + Cl HCl + H2O H3O + Cl -if polyprotic acids: H+ is donated step-wise -is an acid can still donate H+ -is a base daughter of an acid rxn -amphoteric compound-can act as acid or base, depending on situation -usually have 2 properties: -H atoms -neg. charge/partial negativity -base definition can donate OH- -ex: NaOH Na+ + OH- -can accept a H+ -example: HCO3- -acid: HCO3- H+ + CO3-2 (carbonate conjugate) -base: HCO3- + H+ H2CO3 (parent acid) Acid/Base Reactions: -2 types: -H transfer reaction -neutralization reaction -H transfer reaction: -HF + HSO4- F- + H2SO4 -neutralization reaction: -HCl + NaOH H2O + NaCl (aq) -3H2SO4 + 2Al(OH)3 6H2O + Al2(SO4)3 Solutions are compared via concentration:
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Unformatted text preview: -variable that measures amount of substance per unit volume (molarity = M)-molarity – amount of solute in moles present in a liter of solution = mol/L-concentration is a relative quantity-Calculate concentration in M of 25g NaOH which is dissolved in 0.5L solution.-25g x (1 mol/40g) = .625 mol/.5L = 1.25M NaOH Preparing solutions:-use volumetric glassware (volumetric flasks)-bottom of meniscus touches line-solutions can be made from:-a solid and water-a more concentrated solution and water-ex: prepare 2L of .5M NaOH solutions. How do we do this?-add solid to volumetric fask-add water (shake/stir until meniscus sits on line)-MxV = .5mol/L (2.0L) = 1mol NaOH x 40g/1mol = 40.0gNaOH-1: get volumetric flask (2L flask)-2: add 40.0gNaOH to flask-3: add H2O until it reaches line...
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This note was uploaded on 04/23/2008 for the course CH 151 taught by Professor Stevens during the Fall '08 term at Whitworth University.

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Chem notes 10-01 - -variable that measures amount of substance per unit volume(molarity = M-molarity – amount of solute in moles present in a

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