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Lecture 10 Electrolytes;Acid base reactions- Precipitation

# Lecture 10 Electrolytes;Acid base reactions- Precipitation...

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Lec-9: Electrolytes;Acid base reactions: Precipitation Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 1 Dilution of Concentrated Solutions Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 2

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Dilution of Concentrated Solutions Dilution The number of moles are the same in dilute and concentrated solutions. M dilute V dilute = moles = concentrated concentrated Think Moles ! Think Moles !! Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 3 Dilution of Concentrated Solutions What What volume 12.0 volume 12.0 M hydrochloric acid is required to make 500.0 required to make 500.0 mL mL of a 0.145 of a 0.145 M dilute solution? dilute dilute = moles = concentrated concentrated mol mol 0.145 0.5 12 1 conc LV LL mol L ×= × 0.145 0.5 0.0725 12 72.5 conc VL L Lm o l mL × = = Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 4
Question How many mL of commercial HCl (12.0 M) should you use to prepare 240.0 mL of 0.10 M HCl? A) 1.2 × 10 4 L B) 1.2 × 10 3 L C) 2.0 × 10 3 L D) 2.4 × 10 3 L C) 2.0 D) 2.4 M dilute V dilute = moles = concentrated concentrated 0.1 0.24 12 conc mol mol LV LL ×= × 1 0.1 0.24 0.002 12 2 conc mo lL VL L Lm o l L Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 5 2 mL = Electrolytes Ions exist in equilibrium with unionized substance HC 2 H 3 O 2 ( aq ) H + ( ) + C 2 H 3 O 2 - ( ) How do we test for this? Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 6

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Electrolytes HCl( aq ) H + ( aq ) + Cl - ( aq ) AStrong electrolyte - A Strong electrolyte conducts current efficiently Examples: NaCl, HNO 3 , HCl Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 7 Electrolytes Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 8
Non-electrolyte (e.g., CH 3 OH): no ions are formed ` A solution in which no ionization

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Lecture 10 Electrolytes;Acid base reactions- Precipitation...

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