Bath Fizzies Diy

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Bath bombs are hard-packed mixtures of dry ingredients which effervesces when wet. They are used to add essential oils, scent, bubbles and color to bathwater.

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Composition

Bath bombs' primary ingredients are a weak acid and a bicarbonate base. These are unreactive when dry, but react vigorously when dissolved in water to produce their characteristic fizzing over a period of several minutes. This is an acid-base reaction that involves conversion of citric acid and sodium bicarbonate to sodium citrate and carbon dioxide:

C₅H₇O₅CO₂H _(aq.) + NaHCO_{3 (aq.)} -> C₅H₇O₅CO₂^-Na⁺_(aq.) + H₂O_(l) + CO_{2 (g)}

There is also a side saponification reaction that produces soap. This involves a reaction between sodium bicarbonate and water, which gives carbonic acid and sodium hydroxide. Sodium hydroxide, in presence of essential oils, undergoes a reaction to give glycerol and fatty acid salts as follows:

HOCO₂^-Na⁺_(aq.) + H₂O _(l) -> HOCO₂H _(aq.) + NaOH _(aq.) RCO₂CH₂CH(O₂CR?)CH₂CO₂R?_(l) + 3 NaOH _(aq.) -> HOCH₂CH(OH)CH₂OH _(l) + RCO₂Na _(aq.) (+ R'CO₂Na + R''CO₂Na)

The other ingredients in bath bombs can vary considerably. However, most have scented ingredients as well as dye to impart a pleasant fragrance and color to bathwater. Lathering agents, such as sodium lauryl sulfate, are also often added to create bubble foams.

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Production

Bath bombs are generally spherical but can be found in a variety of shapes, such as tablets or lumps. Shops offer a wide range of bombs, but they can also be made at home. A simple DIY method is provided below:

1. Add ½ cup of citric acid, 1 cup of baking soda and ½ cup of corn starch in a bowl
2. Mix in food coloring, fragrance, essential oils, and other decorative elements
3. Tightly pack the mixture into a container
4. Keep mixture inside the fridge for 4-5 hours, or let it stand overnight

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Potential health concerns

Although bath bombs are well tolerated by many people, some additives such as fragrances and dyes can cause irritation. Common skin irritants and allergens found in bath bombs include limonene, linalool and sodium lauryl sulfate. The main ingredients - citric acid and sodium bicarbonate - are generally not considered as skin irritants when used in bath because of significant dilution in water.

Source of the article : Wikipedia