Alkalis
- Created by: Luke Staddon
- Created on: 31-03-14 19:02
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- Alkalis
- Alkalis are a type of chemical
- 1) Alkalis include soluable hydroxides and carbonates (NaOH)(KOH) and Calcium Carbonate
- An alkali is a compound that forms hydroxide ions (OH) when dissolved in water
- 2) An acid and an alkali react together to form a salt and water, The product is neutral.
- 3) Reaction between an acid & a hydroxide gives a salt & water. ACID + HYDROXIDE = SALT + WATER
- 2) Acid and carbonate gives carbon dioxide, salt and water. ACID + CARBONATE = SALT + WATER + CARBON DIOXIDE
- Alkalis have been used for hundreds of years
- 1) Important Chemicals used for all sorts.
- A. Crops need neutral soil to grow, and some soil needs acidic, so it needs to be neutralised before the crops are planted. Farmers use alkalis to neutralise these acidic soils.
- B. Alkalis are used to make chemicals that allow neutral dyes to bind to cloth.
- c. Alkalis are used to convert fats & oils into soap.
- D. They are also used to manufacture glass
- 2) Alkalis have been used for these purposes for many years. Before industrialisation people relied on traditional sources of alkalis such as burnt wood and stale urine.
- 3) Increased uses of alkalis in industry in the 19th century led to a shortage, meaning they had to be manufactured
- 6) This solid waste slowly released hydrogen sulfide, which is toxic and foul smelling.
- 4) The first process for manufacturing an alkali (Sodium carbonate) used limestone (calcium carbonate) and salt (sodium chloride)
- 5) This process created a lot of pollution, large volumes of the acidic gas hydrogen chloride were released along with lots of solid waste
- 1) Important Chemicals used for all sorts.
- Alkalis are a type of chemical
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