GCSE Chemistry notes: Other reactions of soluble bases (alkalis) & insoluble bases
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5. More on other important chemical reactions of insoluble bases and soluble bases (alkalis) e.g. sodium hydroxide and ammonia
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Part 5 Apart from the reactions with acids, this section also covers in detail other reactions of bases (acid reactions are covered in Part 4) with other chemicals e.g. the reaction of the alkali sodium hydroxide with ammonium salts, carbon dioxide and metals salts to give hydroxide precipitates. Word and symbol equations are given for the reaction of the base sodium hydroxide with ammonium salts. Word and symbol equations are given for the formation of metal hydroxide precipitates when sodium hydroxide is added to solutions of soluble metal salts. These revision notes on the reactions of soluble bases (alkalis) and insoluble bases should prove useful for the new AQA chemistry, Edexcel chemistry & OCR chemistry GCSE (9–1, 9-5 & 5-1) science courses.
Doc Brown's chemistry revision notes: basic school chemistry science GCSE chemistry, IGCSE chemistry, O level & ~US grades 8, 9, 10 school science courses for ~14-16 year old science students for national examinations in chemistry topics including acids bases alkalis salts preparations reactions
5. Some important reactions of Bases (alkali = soluble base)
Bases, both soluble and insoluble, react with acids to form salts. Such base may be metal oxides, metal hydroxides, metal carbonates and ammonia. Alkalis (soluble bases) include soluble metal hydroxides, soluble metal carbonates and ammonia.
Reaction of sodium hydroxide with ammonium salts
Ammonium salts are decomposed when mixed with a strong base e.g. the alkali sodium hydroxide produces ammonia gas ...
Use of limestone and lime to control soil acidity is dealt with in the 1st section on the Extra Industrial Chemistry page.
Alkali's (soluble bases) are used to produce the insoluble hydroxide precipitates of many metal ions from their soluble salt solutions.
Aqueous solutions of alkalis like sodium hydroxide ('caustic soda') and calcium hydroxide ('limewater') react with the acidic gas carbon dioxide to form carbonate compounds if the gas is bubbled into their solutions.
GCSE/IGCSE Acids & Alkalis revision notes sub–index: Index of all pH, Acids, Alkalis, Salts Notes 1. Examples of everyday acids, alkalis, salts, pH of solution, hazard warning signs : 2. pH scale, indicators, ionic theory of acids–alkali neutralisation : 4. Reactions of acids with metals/oxides/hydroxides/carbonates, neutralisation reactions : 5. Reactions of bases–alkalis like ammonia & sodium hydroxide : 6. Four methods of making salts : 7. Changes in pH in a neutralisation, choice and use of indicators : 8. Important formulae of compounds, salt solubility and water of crystallisation : 10. More on Acid–Base Theory and Weak and Strong Acids
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