Laboratory

Saline solution is made by dissolving sodium chloride into water.
Saline solution is a solution of salt (sodium chloride) in water. While it’s commercially available, saline solution is easy to make yourself, using nothing more complicated than salt and water. Use the Right Salt and Water If you’re making saline solution to soak sore muscles or as a mouth rinse, […]

How to Make Saline Solution

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Aqua Regia Solutions (Thejohnnler)
Aqua regia is a highly corrosive mixture of hydrochloric acid (HCl) and nitric acid (HNO3) in a molar ratio of 3:1 or 4:1. The name “aqua regia” translates from Latin to mean “king’s water” or “royal water,” referring to the acid’s ability to dissolve the noble metals gold, platinum, and […]

Aqua Regia Definition and Preparation

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Qualitative data describes, while quantitative data is expressed using numbers. (dirkcuys)
There are two types of data. Qualitative data is descriptive information about characteristics that are difficult to define or measure or cannot be expressed numerically. Quantitative data is numerical information that can be measured or counted. Qualitative → Qualities Quantitative → Quantities Examples of Qualitative Data feelings and emotions texture […]

Qualitative and Quantitative Data – Definitions and Examples

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Vodka is used for science experiments because it is a relatively inexpensive form of ethanol in water. (photo credit: Andrew Cheal)
I’m commonly asked why many chemistry ‘recipes’ call for vodka or Everclear as opposed to medical-grade ethanol (alcohol). The answer is simple: It’s easy and inexpensive to obtain vodka, while obtaining medical-grade ethanol, even if you have a permit, can be expensive. Aside from the regulations surrounding ethanol, it’s a […]

Why People Use Vodka for Science Experiments

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