SPM Chemistry Form 4 Notes – Salts (Part 2)

by BerryBerryTeacher

in Berry Reference (Notes)

The chapter Salts is an crucial part in SPM Chemistry Form 4 Notes for SPM Chemistry students. Salts form from the reaction between an acid and a base. Salts have different solubility and mainly are insoluble salts, sparingly soluble salts and soluble salts. All salts of sodium, ammonium, pottasium (SAP), most of the sulphate and all nitrate (SN) are soluble in water. So in this Part 2 post, Berry Berry Easy would like to share the information on the Preparation of Salts and Purification of Salts.

Salts

Salts

SPM Chemistry Form 4 Notes – Salts (Part 2)

Preparation of Salts (Insoluble and Soluble Salts)

Methods and reactions involved in preparation of insoluble salts

  • Must able to determine insoluble salts.
  • Must through precipitation reaction / double decomposition reaction (interchange of two parts of two substances to form two new substances).

Methods and reactions involved in preparation of soluble salts

  • Must able to determine soluble salts.
  • Obtain salt crystal from the saturated salt solution through crystallisation (prepare salt solution –> heat –> cool –> salt crystal form).

Methods and reactions involved in preparation of soluble salts (not salts of Na, K and NH4+)

  • Reaction between acid + metal oxide –> salt(aq) + water
  • Reaction between acid + metal carbonate –> salt(aq) + water + CO2(g)
  • Reaction between acid + reactive metal –> salt(aq) + H2(g)

Methods and reactions involved in preparation of soluble salts (Na, K and NH4+)

  • Reaction between acid + alkali –> salt(aq) + water
  • Must use titration method.

Purification of soluble salts

Impure salt + distilled water –> solution filtered –> filtrate heated –> cool –> crystal obtained.

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