Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. What examples of solid insoluble substances react with acids to form soluble salts?
   • Soluble salts can be made from acids by reacting them with solid insoluble substances, such as metals, metal oxides, hydroxides or carbonates.
2. When an excess of metal oxide reactant is added to an acid, how can the pure salt solution be collected?
   • The solid is added to the acid until no more reacts and the excess solid is filtered off to produce a solution of the salt.
3. What process is used to produce solid soluble salts from salt solutions?
   • Salt solutions can be crystallised to produce solid salts.
4. What are the typical steps are involved in preparing a pure, dry sample of silver chloride from silver nitrate and sodium chloride?
   • Silver chloride is insoluble - you can see this from the table. You need a soluble silver salt and a soluble chloride salt to make it. Silver nitrate and sodium chloride are both soluble. When you mix their solutions together, you make soluble sodium nitrate and insoluble silver chloride: silver nitrate sodium chloride → sodium nitrate silver chloride AgNO3(aq) NaCl(aq) → NaNO3(aq) AgCl(s) The silver chloride appears as tiny Particles suspended in the reaction mixture - it forms a precipitate. The precipitate can be filtered, washed with water on the filter paper, and then dried in an oven.
5. What would the formula be if the following ions reacted to form salts: a) Mg Cl- b) Cu2 S2- c) Fe2 I-
   • a) MgCl2 b) CuS c) FeI2