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This overview explores the concepts of mixtures and ionic reactions, illustrating what combines and what doesn't. It includes practical examples like mixing water and methanol, along with the ionic interaction of potassium iodide and mercuric chloride that demonstrates a color change in a redox reaction. Special attention is given to the formation of barium sulfate, an insoluble precipitate, highlighting its relevance in imaging and X-ray applications. Engage with the chemistry behind these processes and the phenomena of disappearing colors in reactions.
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SOLUTIONS AND PRECIPITATES • What mixes, what doesn’t and Why
MIXTURES: 1 + 1 = 2or Does It? • Add 50 mL of H2O to 50 mL of H2O • ⃗ 100 mL Mixture • Add 50 mL of H2O to 50 mL of MeOH • i.e Water + Methanol (Methyl Alcohol) • ⃗ ?? mL Mixture. WHY?
IMAGING INTERNAL X-RAYS • Need DENSE material to Block X-Rays (BaSO4) • 2BaCl + Na2SO4→Ba2SO4 + 2NaCl • Note: Ba2SO4 is VERY INSOLUBLE in WATER
DISAPPEARING ORANG E REACTION: Now You See It, Now You Don’t ! • Solution A – Potassium Iodide (KI) in H2O • Solution B – Mercuric Chloride (HgCl2) in H2O
DISAPPEARING ORANG E REACTION: Now You See It, Now You Don’t ! • Questions: • Is this a REDOX Reaction? • How can you explain the disappearance of the Orange Color?
DISAPPEARING ORANG E REACTION: Now You See It, Now You Don’t ! • 1.Hg2+ + 2I-⇒HgI2 (Orange) • 2. HgI2 + 2I-⇒ HgI42- (Colorless)
MIXTURES: 1 + 1 = 2or Does It? • Add 50 mL of H2O to 50 mL of H2O • ⃗ 100 mL Mixture • Add 50 mL of H2O to 50 mL of MeOH • i.e Water + Methanol (Methyl Alcohol) • ⃗ ?? mL Mixture.
