At the beginning of the video, two nails sit in separate dishes side by side. Each nail is covered with a solution of agar, potassium ferricyanide and phenolphthalein. The nail on the left is wrapped ...

An essential macronutrient for a range of bodily functions, NHS guidelines suggest adults should consume 3,500mg of potassium every day. Potassium supports your blood pressure, helps to move other ...