Laboratory


From left to right solutions of 0.1 M HCl, 3 buffer solutions of pH 3.78, 3 of pH 4.00, 3 of pH 4.62 and NaOH 0.1 M after adding different amounts of bromocresol green.
It’s easy to prepare bromocresol green indicator solution. Bromocresol green or BCG is a triphenylmethane dye used as a pH indicator for titration, microbial growth media, and DNA agarose gel electrophoresis. However, its most common use is to measure blood serum albumin levels in humans and other mammals when liver […]

How to Make Bromocresol Green Indicator Solution


Bromcresol Purple Chemical Structure
This is the recipe for bromocresol purple, which is a common pH indicator. The final solution will be 0.04% aqueous bromocresol purple. Bromocresol Purple Ingredients Bromocresol purple indicator is an aqueous solution of powdered dye. The solid is a dark violet powder, while the indicator solution is purple. It’s important […]

Bromocresol Purple Indicator Solution Recipe


Distilled water is free of minerals.
Distilled water is water purified by condensing water vapor into liquid water. Usually, the distillation process involves boiling impure water and collected the condensed vapor in a fresh container. However, you can obtain distilled water from damp soil, plants, snow, and rain, too. You can distill water to make drinking […]

How to Make Distilled Water – 5 Easy Methods



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






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


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