userdata-paziras-Chem101-Chap_12A

161gofcarbondioxidein100mlofwaterat20 cand 100atmaso

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: oceans have a higher concentration of disso lved O2 than warm oceans; this affects marine life. 9 Chemistry 101 Chapter 12 II. PRESSURE 1. Solubilit y of Ionic Substances in Water is not affected by pressure changes 2. Solubilit y of Gases in Water Ø is very dependent on pressure changes Ø can be predicted from Henry’s Law · “The Solubilit y o f a gas in water is direct ly proportio nal to the Partial Pressure of the gas above the aqueous solution” S = KH P where S = solubilit y o f the gas P = partial pressure of the gas KH = Henry’s Law Constant = Constant for: ­ a particular solvent ­ at a given temperature S1 S a P P1 ¾¾ = ¾¾ S2 Formula used to calculate the solubilit y o f a gas if the partial pressure changes P2 SUMMARY IONIC SUBSTANCES Effect of Temperature Effect of Pressure GASES solubilit y generally increases Solubilit y decreases No effect Solubilit y increases Example: o The so lubilit y of carbon dioxide in water is 0.161 g of carbon dioxide in 100 mL of water at 20 C and 1.00 atm. A so ft drink is carbonated with carbon dioxide gas at 5.50 atm. of pressure. What is the solubilit y o f carbon dioxide in water at this pressure ? S1 = 0.161 g/100 mL P1 = 1.00 atm S2 = ? P2 = 5.50 atm 5.50 atm S2 = 0.161 g/100 mL x ¾¾¾¾ = 0.886 g/100 mL 1.00 atm 10 Chemistry 101 Chapter 12 CONCENTRATION UNITS · The various methods of expressing concentration of a so lut ion are listed below: A given amount of Solute dissolved in a given amount of CONCENTRATION Molarit y mo les so lute/L so l’n M mo les so lute/mo les sol’n unit less Mass Percent SOLVENT SYMBOL Mole Fract ion SOLUTION UNITS g solute / g sol’n) x 100 % w/w Molalit y mo le so lute / Kg solvent m · The interconversio n of units is an important skill in studying the chemistry of so lut ions. Molarity ® % by mass The mo larit y o f a particular brand of vinegar (solution of acet ic acid, HC2H3O2, in water) is 0.8527 M. The densit y o f vinegar is 1.0052 g/mL. Calculate the mass percent o...
View Full Document

Ask a homework question - tutors are online