CHEM 18b Lecture Notes - Lecture 3: Visible Spectrum, Silver Chloride, Transmittance

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Lab 14:
Gravimetric analysis:
- Number of ionic Cl
- Compare the amt. Of AgCl to find the moles of product and the structure of the product
- The number of AgCl will help us determine how many Cl ions have become ligands
Precipitation reaction creates the silver chloride
Beers law:
A = abc
Absorbance = absorptivity, width of cell, concentration
Problems:
- Wash with less than supposed to would give us higher mass
- If not dry as long as need to also higher mass
- If tarr test tube wrong can give higher or lower mass
Spectrophotometric analysis:
1. Decompose “O” and “P”
Transmittance and absorbance
- Beers law
- Wt. % of Co in product = wt. of Co(g)/wt. Of sample (g) x 100%
Visible spectrum of “O” and “P”
- “O” peaks at blue
- “P” peaks at green because of its wavelength
- The compound emits the color it does not absorb
- It absorbs the color complementary to the color it emits
- “O” absorbs max at 470 and “P” absorbs most at 530
Spliting the 3d electron orditals energy levels
- Cobalt splits its electrons so that the levels of d orbitals are different
- Two on top at a higher energy level (x2-y2 and z2) and three on bottom at a lower energy
level (xy, yz, xz)
Lab 15:
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Document Summary

Of agcl to find the moles of product and the structure of the product. The number of agcl will help us determine how many cl ions have become ligands. Wash with less than supposed to would give us higher mass. If not dry as long as need to also higher mass. If tarr test tube wrong can give higher or lower mass. % of co in product = wt. of co(g)/wt. P peaks at green because of its wavelength. The compound emits the color it does not absorb. It absorbs the color complementary to the color it emits. O absorbs max at 470 and p absorbs most at 530. Cobalt splits its electrons so that the levels of d orbitals are different. Two on top at a higher energy level (x2-y2 and z2) and three on bottom at a lower energy level (xy, yz, xz) Rate of reaction change in concentration per unit time (mol/s)

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