Fichas
making salts
Fichas del conjunto (13)
- 1What is a salt?a compound formed when the hydrogen in an acid is wholly or partially replaced by metal (or ammonium) ions
- 2All acids contain hydrogen--which is released as hydrogen ions when the acid is dissolved in water.
- 3metal + acidsalt + hydrogen
- 4How can a sample of salt be made from this reaction?• some of the water is evaporated until crystallisation is reached
• can be left at room temperature to evaporate - 5The acid used always provides the negative ions present.. Give the types of salt formed.• hydrochloric acid, HCl
→ chloride + Cl-
• sulphuric acid, H2SO4
→ sulphate + SO4 2-
• nitric acid, HNO3-
→ nitrate + NO3- - 6Explain why the reaction between a metal and acid is a redox equation. (displace = donate)• the metal atoms lose electrons + are oxidised
• the hydrogen atoms gain electrons + are reduced
• the acid ions (ie. sulfate) are spectator ions as they do not change
• the metal ions will always displace the hydrogen atoms in the acid, donating electrons to the hydrogen atoms - 7Give the ionic and half equations for the reaction: magnesium + sulphuric acid → magnesium sulphate + hydrogenMg + 2H+ → H2 + Mg2+
• the magnesium ion loses electrons, it is oxidised
Mg - 2e- → Mg2+
• the hydrogen atoms gain electrons and are reduced
2e- + 2H+ → H2 - 8What is the difference between alkalis and bases?bases: compounds able to neutralise acids
alkalis: bases which are soluable in water - 9acid + basesalt + water
- 10Do salts have an overall charge?No, like all ionic compounds, the sum of the charges on their ions is zero.
- 11acid + alkalisalt + water
- 12Describe the ions in a neutralisation reaction.the H+ (from acids) and OH- (from alkalis) react to form water molecules
H + OH → H2O - 13acid + carbonatesalt + water + carbon dioxide
Información
- Descripción
- • 5.4: salts from metals • 5.5: salts from insoluble bases • 5.6: making more salts
- Creado por
- Farha Idrees
- Visitas
- 6
- Valoración