Chemistry 121

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Chemistry 121

• Slides for week of 30 October

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Check-in

•         CO (g) 2 H2 (g) ? CH3OH (g)
• a) some of the CH3OH (g) is removed while the
  volume is held constant
• b) some CO (g) is added to the system while the
  volume is held constant
• c) The system is compressed to a smaller volume
• d) Some N2 (g) is added to the system while the
  volume is held constant

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Check-in

• acid or base?
• soap
• grapefruit juice
• cocoa (unsweetened)
• windex (window cleaner)
• soda (pop)

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Strong acid
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Weak acid
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pH scale
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Check-in

• What is the conjugate base of HCO3-?
• H2CO3CO32- H2O OH-
• What is the conjugate acid of HCO3-?
• H2CO3CO32- H2O OH-
• Which of the reactions below shows the
  bicarbonate ion, HCO3-, acting as an acid? (There
  may be more than one.)
•   HCO3- HCl ? Cl- H2CO3  HCO3- H2O ? OH-
  H2CO3  HCO3- H2O ? H3O CO32-  HCO3- NaCl
  ?  Cl- NaHCO3 
• Is the bicarbonate ion, HCO3-, an acid or a base?
  How do you know?