+ experimental chemistry measurements in chemistry
TRANSCRIPT
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+
Experimental Chemistry
Measurements in Chemistry
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+Measurements in Chemistry
Four basic physical quantities measured in Chemistry experiments:
1. Volume
2. Temperature
3. Time
4. Mass
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+Measurement: Volume of Liquids
The apparatus used depends on:– the volume being measured–how accurate the measurement needs to be
Common apparatus: Measuring cylinder Burette Pipette Beaker** Conical flask**
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+Measurement: Volume of Liquids
Measuring cylinder Only used for measuring
approximate volume Accurate only to the
nearest 1 cm3
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+Measurement: Volume of Liquids
Bulb pipette Measures out precise
volumes EXACTLY 20.0 cm3, 25.0
cm3 or 50.0 cm3
Used with a pipette filler
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+Measurement: Volume of Liquids
Burette Long scale: 0 cm3 to 50 cm3
Each graduation is 0.1 cm3
Accurate up to 0.05 cm3
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+Other Measurements
Physical quantity to be measured
Apparatus
volume of gases gas syringe Measures up to 100 cm3
temperature thermometer Accuracy to 0.5°Ctime digital
stopwatchMeasures to nearest second
mass of substance electronic balance
Measures to nearest 0.01 g
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+Apparatus for Chemistry Experiments
Water bath: Heating flammable liquid
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+Apparatus for Chemistry Experiments: Rates of reaction
Change in mass
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+Apparatus for Chemistry Experiments: Rates of reaction
Collecting and measuring a volume of gas Conical flask VS test tube
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+Collection of GasesMethods depends on the physical properties of the
gas the solubility of the gas in water the density of the gas compared to air
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+Collection of Gases: Solubility & Density of Common Gases
Gas Solubility in water Density compared to air
ammonia extremely soluble less dense
carbon dioxide slightly soluble denser
chlorine soluble denser
hydrogen not soluble less dense
oxygen very slightly soluble slightly denser
sulfur dioxide very soluble denser
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+Collection of Gases:Dry Samples
Dry samples can be obtained by passing the gas through a drying agent.
Common drying agents:
concentrated sulfuric acid [ ammonia]✗
quicklime (calcium oxide) [ ammonia]✓
Fused calcium chloride
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+Concentrated Sulfuric acid
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+Quicklime & Fused Calcium Chloride
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+Data Logging