Опубликовал Admin
28-10-2020, 23:40
128
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How to Purge a Burette for a Titration
To reduce the risk of contamination and miscalculation during a titration, it is always good to rinse and purge your burette. Improperly purged burettes could yield imprecise results, necessitating another titration. Ensure the integrity of your experiments by cleaning your burette properly before and after each use.
Опубликовал Admin
27-10-2020, 06:50
519
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How to Test for CO₂
Carbon dioxide (CO2) is colorless and odorless, so you can't detect it through direct observation. You'll need to collect an air sample (or a CO2 sample), then run one of several simple tests to identify the presence of the gas. You can bubble the gas through limewater, or you can hold a lit splint into the sample to see if it is extinguished by the presence of CO2.
Опубликовал Admin
22-10-2020, 12:10
134
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How to Work Safely With Chemicals
Experimenting with chemicals can be educational, but you need to use proper safety procedures to keep yourself safe. It is important to wear proper safety gear to avoid burning yourself, inhaling chemicals, or injuring yourself. Refrain from handling chemicals in unsafe locations or without proper equipment.
Опубликовал Admin
18-10-2020, 21:50
122
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How to Add Hot Tub Chemicals
Hot tubs, like swimming pools, require regular maintenance. However, because of their temperature, hot tubs need to be serviced more regularly. The pH, alkalinity, water hardness, sanitation, and general cleanliness must be maintained. With proper care and attention, you can simply add chemicals in the appropriate amounts to accomplish the majority of hot tub's maintenance needs.
Опубликовал Admin
12-10-2020, 12:00
150
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How to Prepare Sea Water in a Lab
The basic laboratory sea water formula, which is great for general lab use, requires only a 35 parts per thousand (ppt) mixture of household salt and tap water. More complex sea water formulas also exist, and require the use of more ingredients and distilled water, but are mixed in much the same manner. You can use any type of lab-made sea water to do a quick but fun density experiment
Опубликовал Admin
10-10-2020, 22:20
690
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How to Crystallize Organic Compounds
Crystallization (or recrystallization) is the most important method for purification of organic compounds. The process of removing impurities by crystallization involves dissolving a compound in an appropriate hot solvent, allowing the solution to cool and become saturated with the compound being purified, allowing it to crystallize out of the solution, isolating it by filtration,
Опубликовал Admin
27-09-2020, 16:20
144
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How to Handle Acids
Concentrated acids are extremely corrosive to all body tissue, especially eyes and skin. Due to this powerful corrosiveness, acids are highly toxic. However, if handled safely with the right equipment, acids need not be feared. Use acids confidently by learning how to protect yourself, how to use the proper lab equipment, and what to do in the event of spills and other emergencies.
Опубликовал Admin
23-09-2020, 00:10
165
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How to Clean Up an Isopropyl Alcohol Spill
Isopropyl alcohol is a common chemical used for cleaning and diluting mixtures. Spilling isopropyl alcohol can be scary, since it is very flammable. However, as long as you work quickly and remove any objects that can produce a flame from the area, you can clean up an isopropyl alcohol spill safely.
Опубликовал Admin
17-09-2020, 21:10
203
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How to Study the Chemical Theory of Valence Bonds
Atoms are considered the building blocks of matter. As such, the properties and interactions of atoms are of great interest to scientists. One important property of an atom is how many electrons it has in its outermost shell. These are known as valence electrons and are responsible for the bonding interactions of that atom. The valence bond theory aims to describe and predict these
Опубликовал Admin
13-10-2018, 16:00
420
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Nuclear magnetic resonance (NMR) is one of the most widely used methods to identify chemical compounds, especially organic ones. It relies on the principle of nuclear spin; when an atom's nucleus is placed in a strong magnetic field, its magnetic field aligns with the direction of the field. When energy, in the form of radio waves, is applied, some of the nuclei spin against the field.