An exothermic reaction occurs when $$$\mathrm{NH}_{4}^{+}(\mathrm{aq})$$$ is added to $$$\mathrm{OH}^{-}(\mathrm{aq})$$$. (i) Identify the type of reaction. ................................................................................................................................. (ii) Construct an ionic equation for the reaction of $$$\mathrm{NH}_{4}^{+}$$$and $$$\mathrm{OH}^{-}$$$. .................................................................................................................................

Chemistry

IGCSE&ALevel

CAIE

Exam No：9701_s24_qp_23 Year：2024 Question No：4(b)

Answer:

Knowledge points:

7.2.1 state the names and formulae of the common acids, limited to hydrochloric acid, HC/, sulfuric acid, ethanoic acid,

7.2.10 select suitable indicators for acid-alkali titrations, given appropriate data

7.2.2 state the names and formulae of the common alkalis, limited to sodium hydroxide, NaOH, potassium hydroxide, KOH, ammonia,

7.2.3 describe the Brønsted–Lowry theory of acids and bases

7.2.4 describe strong acids and strong bases as fully dissociated in aqueous solution and weak acids and weak bases as partially dissociated in aqueous solution

7.2.5 appreciate that water has pH of 7, acid solutions pH of below 7 and alkaline solutions pH of above 7

7.2.6 explain qualitatively the differences in behaviour between strong and weak acids including the reaction with a reactive metal and difference in pH values by use of a pH meter, universal indicator or conductivity

7.2.7 understand that neutralisation reactions occur when

7.2.8 understand that salts are formed in neutralisation reactions

7.2.9 sketch the pH titration curves of titrations using combinations of strong and weak acids with strong and weak alkalis

Answer:

Knowledge points:

Solution:

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