10-10.4 - Heterogenous mixtures Not uniform Properties vary...

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1 Not uniform Uniform Properties vary with sample Every sample the same Homogeneous mixtures Heterogenous mixtures Root beer float with lumps of ice cream suspended in root beer Pulpy orange juice Dr. Pepper Apple juice Section 10.0 Solute Solvent Substance being dissolved Present in smallest amount Substance doing the dissolving Present in largest amount Homogeneous mixtures Section 10.1 Solute Solvent Substance Soft drink Gas (CO 2 ) Solid (C 12 H 22 O 11 ) Liquid (H 2 O) Air Gas (O 2 ) Gas (N 2 ) Sterling silver Solid (Cu) Solid (Ag) Vinegar Liquid (HC 2 H 3 O 2 ) Liquid (H 2 O) Section 10.1 X 32 g CH 3 OH 1 mol CH 3 OH Molarity Moles of solute per liter of solution. M = mol/L 64 g CH 3 OH 4 L = 0.5 M What is the molarity of CH 3 OH in a solution which contains 64 g CH 3 OH in 4 L of water? Section 10.1 [CH 3 OH] = 0.5 M “The concentration of methanol is 0.5 moles per liter” Concentration M = mol/L Molarity Moles of solute per liter of solution. Molarity of a typical soft drink based on the sugar content 39 g C 12 H 22 O 11 in 330 mL of solution X 342 g C 12 H 22 O 11 1 mol C 12 H 22 O 11 39 g C 12 H 22 O 11 330 mL X 1000 mL 1 L Section 10.1 = 0.35 M [C 12 H 22 O 11 ] Concentration Section 10.1 Concentration some stuff busts up, like ionic compounds and strong acids Mg 2+ (aq) + 2ClO 4 1- (aq) 11 moles 4 L 11 moles 4 L 22 moles 4 L 2.75 M Mg(ClO 4 ) 2 2.75 M Mg 2+ 5.50 M ClO 4 1- 8.25 M ions Mg(ClO 4 ) 2 (s) A chemist may say this as short-hand A chemist really means this
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2 How many moles of Al(NO 3 ) 3 are required to make 43 mL of a 0.10 M Al(NO 3 ) 3 solution? 0.10 mol Al(NO 3 ) 3 1 L solution = 0.0043 mol Al(NO 3 ) 3 x 0.043 L 0.0043 mol Al(NO 3 ) 3 How many grams of Al(NO 3 ) 3 are required to make 43 mL of a 0.10 M Al(NO 3 ) 3 solution? x 213 g Al(NO 3 ) 3 1 mol Al(NO 3 ) 3 = 0.92 g Al(NO 3 ) 3 Section 10.1 Volume x concentration = moles x 3 mol NO 3 1- 1 mol Al(NO 3 ) 3 = 0.013 mol NO 3 1- How many moles of NO 3 1- are present in 43 mL of a 0.10 M Al(NO 3 ) 3 solution?
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This note was uploaded on 03/30/2010 for the course CH 101 taught by Professor Bigham during the Fall '08 term at N.C. State.

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10-10.4 - Heterogenous mixtures Not uniform Properties vary...

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