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Vapor Pressure
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- Di ko siya maexplain fully pero basta, gagamitin lang yang formula
- Usually given naman yung constant which is VAPOR PRESSURE OF PURE SOLVENT
- More more manipulate lang
- X lamona yon computing, mole fract ng SOLVENT HA REMEMBER
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2. Boiling point elevation
Δ Tb = Kb m
Kb = (called the boiling-point-elevation constant),
depends only on the solvent
m = molal concentration of the
solution
T =ΔT +T
bsol’n b bsolvent
Eto same lang, legit manipulation lang talaga ng formula, example
- Problem number four, sa paper na binigay mo
- Calculate the boiling pt of sol’n made from 227g of MgCl2 dissolve in 700.0 g water. What us
the boiling pt of solution? Kb=0.512C/m
Given:
227 g- Mass of MgCl2 – eto ay may vanthoff factor na i=3
700.0 g – mass of water
Kb = 0.512
100.00 C = boiling point of water
Solve muna for delta Tb (Δ Tb)
∆ Tb=i Kb m
227
95.21
∆ Tb=3 x 0.512 x
700
1000
∆ Tb=5.24 C
227
95.21
∆ Tb=3 x 0.512 x
700
1000
3. Freezing point
- Same tot lang wth yung nauna
- Lamona
- Manipulate
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Δ Tf = Kf m
Kf = (called the freezing-point-elevation constant), depends only on
the solvent
m= molal concentration of the solution
T =T -ΔT
fsol’n fsolvent f
- Problem 1 sa bninigay mo
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4. Osmotic Pressure
- Pangurat to
- Maraming eme masyado
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- So ditto parang ideal gas law lang siya
- Remmeebr lang yung units, dapat nakabase units bago ka magproceed sa pagsosolve
- Exaample
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- Look: cinonvert niya yung torr into ATM kasi daoat base units
- Di siya directly nakakuha ng answer on the first formula so tinimes niya yung M na nakuha
sa L of solution
- After makakuha ng moles, since MOLAR MASS HINIHINGI, divide mo ngayon yung grams
given over mole na nasolve mo
VANT HOFF FACTORS
- Magkakroon lang ng vanthoff for ionic
- If ionic pinagrereact mo
- Then ionic again is metal and NM
- Tas para macount yung i
- Bilangin ilan CHARGE ng both element then PLUS
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